2009年安徽省普通高中学业水平考试数学试卷真题 - 图文

promotion of employment, form a reasonable and orderly pattern of income distribution, build a more fair and sustainable social security systems, medical and health system reform. The plenary, innovation of social governance, must focus on the maintenance of fundamental interests of the overwhelming majority of the people, maximize factors, enhance social development, improving social governance, the interests of national security, ensure that the people live and work, social stability and order. o improve social governance, stimulating social organization, innovative and effective system of preventing and resolving social conflicts, improving the public security system, set up the National Security Council, national security systems and national security strategy to ensure national security. Plenary session, the construction of ecological civilization, you must establish systems of ecological system, using the system to protect the ecological environment. o improve natural resources asset property right system and use control, red line of delimitation of ecological protection, resources paid use system and ecological compensation system in ecological environment protection management system reform. Plenary session, centering on building a listening party command, can win and having a fine style of the people's army, a strong army under the new situation of the party Goals, restricting the development of national defense and army building is solved outstanding contradictions and problems, innovation and development of military theory, enhance military strategic guidance, improve the military strategy in the new period, building a modern military force system with Chinese characteristics. o deepen the adjustment of personnel system reform in the army, military policy and system reform, promote the development of military and civilian integration depth. Plenary session stressed that comprehensive reform must be to strengthen and improve the party's leadership, give full play to the core role of the party commands the overall situation and coordinating all parties, improving the party's leading water ... Margin. Challenged the leadership of the Communist Party of China, Marxism-Leninism and Mao Zedong thought by Deng Xiao-ping's flag, replaced by three representatives and the harmonic society. The former Communist Party spirit and social cohesion point of almost all political makeover. Characteristics of socialism public ownership is shifting to private ownership, planned regulation and market regulation, the proletarian regime controlled by the elite. Of universal equality, fairness and basic principles of distribution system is socialist society, however after economic monopolized by powerful, vested interests grow, employers do not have the same status, hardly seems fair social distribution. State key protection of capital interests rather than the interests of citizens, had been hits the bottom of the proletariat2009年安徽省普通高中学业水平测试

7.某校一周课外自习时间(h)的频率分布直方图如图,则该 数 学

校学生一周课外自习总时间在区间[5,9)内的频率是

A,0.08 B,0.32 C,0.16 D,0.64

8.下列几何体各自的三视图中,有且仅有两个视图相同的几何体是 第I卷（选择题 共54分）

一,选择题:本大题共18小题,每小题3分,共54分,在每小题给出的四个选项中,只有一项是符合题目要求 的.

1.已知集合P?{?1,0,1},Q?{0,1},则PQ?

A,{0} B,{0,1} C,{?1,0} D,{?1,0,1} A,圆锥 B,正方体 C,正三棱柱 9.下列各式中,值为32.cos(?60)? 2的是

2222 A,1 A,sin15c?os15 B,2sin15cos15 C,cos15s?in15 2 B,32 C,?12 D,?32 10.已知向量a?(?1,2),b?(5,k),若a//b,则实数k的值是 3.函数f(x)?x2?x的零点是

A,5 B,?5 C,10 A,0 B,1 C,0,1 D,(0,0),(1,0) 11.已知角?的终边上一点P的坐标是(sin,??cos?),则sin?? 4,坐标原点到直线3x?4y??50的距离为 A,?cos? B,cos? C,?sin? A,1 B,2 C,3 D,4

12.抛掷一颗骰子,事件M表示“向上一面的数是奇数”,事件N表示

5.阅读以下流程图:

“向上一面的数不超过3”,事件Q表示“向上一面的数是5”,则

A,M为必然事件 B,Q为不可能事件

如果输入x?4,则该程序的循环体执行的次数是

C,M与N为对立事件 D,Q与N为互斥事件

A,1次 B,2次 C,3次 D,4次

13.如图,在?ABC中,如果 O为BC边上的中线AD上的点, 6.圆心在直线x?y?2?0上的圆的方程是

且OA?OB?OC?0,那么

A,(x?1)2?(y?1)2?4 B,(x?1)2?(y?1)2?4 A,AO?OD B,AOO?2D C,AOO?3D C,(x?1)2?(y?1)2?4 D,(x?1)2?(y?1)2?4 14.将甲,乙两名同学5次物理测验的成绩用茎叶图表示如图,若甲,乙

bviously, face China's Socialist system, the Communist Party is not the party. In that case, political chaos has been very tight. Is remodeling or reconstruction, is a correction or a stove. Whether to turn right or left, is back to the source or put forward new political ideas. This is to determine the road problems in China, is also the key out of the deep water of the reform of the economic system. After 18, the new Central collective leadership attaches great importance to political orientation. First, the \s\ng from the Central Government's self-restraint, which preaches and pro-image, brought fresh feeling to the community. Secondly, before reform and opening up and reform and opening two periods after non-negative, untying the tangle of the society a long time on this issue. Third, a new generation of party leaders on various occasions to Mao Ze-Dong and Mao Ze-Dong's thought of evaluation has room for manoeuvre, through to the ruling ideology of Mao Zedong thought, is the call of the soul to the Socialist Revolution and construction. Empty talks jeopardize national interests and try again, is an affirmation of Deng Xiao-ping's reform ideas. These strong political signal showing a new generation of political leaders is still keeping to the Socialist road. Four is revisiting the \o Ze-Dong's historical cycle of\profile anti-corruption and the importance of the Constitution, reorganization is bad style of officialdom, was to civilize people obey the law, while improving the color change of the regime of vigilance. Five is to reform into deeper waters and stressed that top-level design, this is a review on the reform and opening up in the past, is also looking for a way out. Six foreign and Russia closer, the flexible attitude on the issue of the Korean peninsula, Sino-Japanese fishing hardline China on the island out of the \nt\Also stresses that Mao Zedong thought cannot be lost, 30 years after the reform and opening up 30 years ago can not deny each other. Both advocate democracy and release \does not speak of\constraints. Neither deny the history of the CPC Central Committee on several issues ...Comrades: today brings together members, mainly in order to provide a platform to Exchange and learn from each other in order to facilitate our work. Just now, we focus on taxation, planning and stability, safety, project construction, typical topics such as private facts presentation and interaction, and towns currently exist in the in-depth analysis of the problems to be solved, to explore new methods to solve the problem. It can be said that summing up the achievement, no grandstanding; analysisD,球 D,2sin215?1 D,?10 D,sin? D,ODA?2O

o gradually plan development. Signs show that the new leadership began to make a left turn in politics. However, as of right now, not only ideological confusion in the community, the new leadership's thinki两人成

both stressed the need to implement the Constitution, stressed the need to turn off the power in a cage. ow profile shadow began tng is messy. New leaders promotion of employment, form a reasonable and orderly pattern of income distribution, build a more fair and sustainable social security systems, medical and health system reform. The plenary, innovation of social governance, must focus on the maintenance of fundamental interests of the overwhelming majority of the people, maximize factors, enhance social development, improving social governance, the interests of national security, ensure that the people live and work, social stability and order. o improve social governance, stimulating social organization, innovative and effective system of preventing and resolving social conflicts, improving the public security system, set up the National Security Council, national security systems and national security strategy to ensure national security. Plenary session, the construction of ecological civilization, you must establish systems of ecological system, using the system to protect the ecological environment. o improve natural resources asset property right system and use control, red line of delimitation of ecological protection, resources paid use system and ecological compensation system in ecological environment protection management system reform. Plenary session, centering on building a listening party command, can win and having a fine style of the people's army, a strong army under the new situation of the party Goals, restricting the development of national defense and army building is solved outstanding contradictions and problems, innovation and development of military theory, enhance military strategic guidance, improve the military strategy in the new period, building a modern military force system with Chinese characteristics. o deepen the adjustment of personnel system reform in the army, military policy and system reform, promote the development of military and civilian integration depth. Plenary session stressed that comprehensive reform must be to strengthen and improve the party's leadership, give full play to the core role of the party commands the overall situation and coordinating all parties, improving the party's leading water ... Margin. Challenged the leadership of the Communist Party of China, Marxism-Leninism and Mao Zedong thought by Deng Xiao-ping's flag, replaced by three representatives and the harmonic society. The former Communist Party spirit and social cohesion point of almost all political makeover. Characteristics of socialism public ownership is shifting to private ownership, planned regulation and market regulation, the proletarian regime controlled by the elite. Of universal equality, fairness and basic principles of distribution system is socialist society, however after economic monopolized by powerful, vested interests grow, employers do not have the same status, hardly seems fair social distribution. State key protection of capital interests rather than the interests of citizens, had been hits the bottom of the proletariat绩的中位数分别是x甲,x乙,则下列说法正确的是

A,x甲?x乙,乙比甲成绩稳定 B,x甲?x乙;甲比乙成绩稳定 C,x甲?x乙;乙比甲成绩稳定 D,x甲?x乙;甲比乙成绩稳定 15.不等式(x?1)(x?2)?0的解集在数轴上表示正确的是

A B C D 16.如图,有一条长为a的斜坡AB,它的坡角为45,现保持坡高AC不 变,将坡角改为30,则斜坡AD的长为

A,a B,2a C,3a D,2a 17.当a,b?R时,下列各式总能成立的是

A,6(a?b)6?a?b B,4(a2?b24)?a2?b2 C,4a4?4b4?a?b D,3a2?3b2?a2?b2 18.已知x?0,y?0且x?y?1,则4x?1y的最小值是 A,7 B,8 C,9 D,10

第II卷（非选择题 共46分）

二、填空题:本大题共4小题,每小题4分,共16分,把答案填在题中的横线上 19.从甲,乙,丙三人中任选两名到一所乡村中学支教,甲被选中的概率是 20.若fx()?sin(1x???)(||??22)的图象(部分)如图,则?的值是

21.已知过点A(?2,m)和B(m,4)的直线与直线2x?y??10垂直,则实数m的值是

bviously, face China's Socialist system, the Communist Party is not the party. In that case, political chaos has been very tight. Is remodeling or reconstruction, is a correction or a stove. Whether to turn right or left, is back to the source or put forward new political ideas. This is to determine the road problems in China, is also the key out of the deep water of the reform of the economic system. After 18, the new Central collective leadership attaches great importance to political orientation. First, the \s\ng from the Central Government's self-restraint, which preaches and pro-image, brought fresh feeling to the community. Secondly, before reform and opening up and reform and opening two periods after non-negative, untying the tangle of the society a long time on this issue. Third, a new generation of party leaders on various occasions to Mao Ze-Dong and Mao Ze-Dong's thought of evaluation has room for manoeuvre, through to the ruling ideology of Mao Zedong thought, is the call of the soul to the Socialist Revolution and construction. Empty talks jeopardize national interests aAlso stresses that Mao Zedong thought cannot be lost, 30 years after the reform and opening up 30 years ago can not deny each other. Both advocate democracy and release \does not speak of\constraints. Neither deny the history of the CPC Central Committee on several issues ...Comrades: today brings together members, mainly in order to provide a platform to Exchange and learn from each other in order to facilitate our work. Just now, we focus on taxation, planning and stability, safety, project construction, typical topics such as private facts presentation and interaction, and towns currently exist in the in-depth analysis of the problems to be solved, to explore new methods to solve the problem. It can be said that summing up the achievement, no grandstanding; analysis22.设a,b,c均为正数,且(1)a?loga,(1)b?logb,2lc2122?og1c,则a,b,c之间的大小关系是 22三,解答题:本大题共3小题,功30分,解答应写出文字说明,证明过程或演算步骤, 23.(本小题满分10分)等差数列{a2n}中,且a2?2a4,求数列{an}的前10项的和S10.

24.(本小题满分10分)如图,在棱长均为1的直三棱柱ABC?A1B1C1中,D,D1分别是BC,BC11的中点. (Ⅰ)求证:平面ABD11//平面AC1D; (Ⅱ)求异面直线AC1与BD1所成角的余弦值.

25.(本小题满分10分)某企业拟生产甲,乙两种产品,根据市场调研预测,甲产品的利润y与投资额x的算术平方根成正比,其关系如图一;乙产品的利润y与投资额x成正比,其关系如图二. (Ⅰ)分别将甲,乙两种产品的的利润y表示为投资额x的函数关系式;

(Ⅱ)如果企业将筹集到的160万元资金全部投入到甲,乙两种产品的生产中,试问:怎样分配这160万元 的投资才能使该企业获得最大利润,最大利润是多少?

ffirmation of Deng Xiao-ping's reform ideas. These strong political signal showing a new generation of political leaders is still keeping to the Socialist road. Four is revisiting the \o Ze-Dong's historical cycle of\profile anti-corruption and the importance of the Constitution, reorganization is bad style of officialdom, was to civilize people obey the law, while improving the color change of the regime of vigilance. Five is to reform into deeper waters and stressed that top-level design, this is a review on the reform and opening up in the past, is also looking for a way out. Six foreign and Russia closer, the flexible attitude on the issue of the Korean peninsula, Sino-Japanese fishing hardline China on the island out of the \nt\ow profile shadow began to gradually plan development. Signs show that the new leadership began to make a left turn in politics. However, as of right now, not only ideological confusion in the community, the new leadership's thinking is messy. New leaders both stressed the need to implement the Constitution, stressed the need to turn off the power in a cage.

nd try again, is an apromotion of employment, form a reasonable and orderly pattern of income distribution, build a more fair and sustainable social security systems, medical and health system reform. The plenary, innovation of social governance, must focus on the maintenance of fundamental interests of the overwhelming majority of the people, maximize factors, enhance social development, improving social governance, the interests of national security, ensure that the people live and work, social stability and order. o improve social governance, stimulating social organization, innovative and effective system of preventing and resolving social conflicts, improving the public security system, set up the National Security Council, national security systems and national security strategy to ensure national security. Plenary session, the construction of ecological civilization, you must establish systems of ecological system, using the system to protect the ecological environment. o improve natural resources asset property right system and use control, red line of delimitation of ecological protection, resources paid use system and ecological compensation system in ecological environment protection management system reform. Plenary session, centering on building a listening party command, can win and having a fine style of the people's army, a strong army under the new situation of the party Goals, restricting the development of national defense and army building is solved outstanding contradictions and problems, innovation and development of military theory, enhance military strategic guidance, improve the military strategy in the new period, building a modern military force system with Chinese characteristics. o deepen the adjustment of personnel system reform in the army, military policy and system reform, promote the development of military and civilian integration depth. Plenary session stressed that comprehensive reform must be to strengthen and improve the party's leadership, give full play to the core role of the party commands the overall situation and coordinating all parties, improving the party's leading water ... Margin. Challenged the leadership of the Communist Party of China, Marxism-Leninism and Mao Zedong thought by Deng Xiao-ping's flag, replaced by three representatives and the harmonic society. The former Communist Party spirit and social cohesion point of almost all political makeover. Characteristics of socialism public ownership is shifting to private ownership, planned regulation and market regulation, the proletarian regime controlled by the elite. Of universal equality, fairness and basic principles of distribution system is socialist society, however after economic monopolized by powerful, vested interests grow, employers do not have the same status, hardly seems fair social distribution. State key protection of capital interests rather than the interests of citizens, had been hits the bottom of the proletariat2009年安徽省普通高中学业水平测试

数学试卷(参考答案)

一,选择题

1,已知集合P,则PQ ( D ) ?{?1,0,1},Q?{0,1}?

A,圆锥 B,正方体 C,正三棱柱 D,球 A,{0} B,{0,1} C,{?1,0} D,{?1,0,1} 2,cos(?60)? ( A ) 9,下列各式中,值为32的是 A,sin22 A,115c?os15 B,2sin15cos15 C,cos15s?in15 2 B,313222 C,?2 D,?2 10,已知向量a?(?1,2),b?(5,k),若a//b,则实数k的值是 3,函数f(x)?x2?x的零点是 ( C ) A,5 B,?5 C,10 A,0 B,1 C,0,1 D,(0,0),(1,0) 11,已知角?的终边上一点P的坐标是(sin,??cos?),则sin?? 4,坐标原点到直线3x?4y??50的距离为 ( A ) A,?cos? B,cos? C,?sin? A,1 B,2 C,3 D,4

12,抛掷一颗骰子,事件M表示“向上一面的数是奇数”,事件N表示 5,阅读以下流程图: ( C )

“向上一面的数不超过3”,事件Q表示“向上一面的数是5”,则 ( D )

A,M为必然事件 B,Q为不可能事件

如果输入x?4,则该程序的循环体执行的次数是

C,M与N为对立事件 D,Q与N为互斥事件

A,1次 B,2次 C,3次 D,4次 13,如图,在?ABC中,如果 O为BC边上的中线AD上的点, 6,圆心在直线x?y?2?0上的圆的方程是 ( C ) 且OA?OB?OC?0,那么 A,(x?1)2?(y?1)2?4 B,(x?1)2?(y?1)2?4 A,AO?OD B,AOO?2D C,AOO?3D C,(x?1)2?(y?1)2?4 D,(x?1)2?(y?1)2?4 14,将甲,乙两名同学5次物理测验的成绩用茎叶图表示如图,若甲,乙

绩的中位数分别是x甲,x乙,则下列说法正确的是 7,某校一周课外自习时间(h)的频率分布直方图如图,则该

A,x甲?x乙,乙比甲成绩稳定 B,x甲?x乙;甲比乙成绩稳定 校学生一周课外自习总时间在区间[5,9)内的频率是( B )

A,0.08 B,0.32 C,0.16 D,0.64

C,x甲?x乙;乙比甲成绩稳定 D,x甲?x乙;甲比乙成绩稳定 8,下列几何体各自的三视图中,有且仅有两个视图相同的几何体是 ( A )

15,不等式(x?1)(x?2)?0的解集在数轴上表示正确的是 (D )

bviously, face China's Socialist system, the Communist Party is not the party. In that case, political chaos has been very tight. Is remodeling or reconstruction, is a correction or a stove. Whether to turn right or left, is back to the source or put forward new political ideas. This is to determine the road problems in China, is also the key out of the deep water of the reform of the economic system. After 18, the new Central collective leadership attaches great importance to political orientation. First, the \point, starting from the Central Government's self-restraint, which preaches and pro-image, brought fresh feeling to the community. Secondly, before reform and opening up and reform and opening two periods after non-negative, untying the tangle of the society a long time on this issue. Third, a new generation of party leaders on various occasions to Mao Ze-Dong and Mao Ze-Dong's thought of evaluation has room for manoeuvre, through to the ruling ideology of Mao Zedong thought, is the call of the soul to the Socialist Revolution and construction. Empty talks jeopardize national interests and try again, is an affirmation of Deng Xiao-ping's reform ideas. These strong political signal showing a new generation of political leaders is still keeping to the Socialist road. Four is revisiting the \ao Ze-Dong's historical cycle of\e anti-corruption and the importance of the Constitution, reorganization is bad style of officialdom, was to civilize people obey the law, while improving the color change of the regime of vigilance. Five is to reform into deeper waters and stressed that top-level design, this is a review on the reform and opening up in the past, is also looking for a way out. Six foreign and Russia closer, the flexible attitude on the issue of the Korean peninsula, Sino-Japanese fishing hardline China on the island out of the \Also stresses that Mao Zedong thought cannot be lost, 30 years after the reform and opening up 30 years ago can not deny each other. Both advocate democracy and release \does not speak of\constraints. Neither deny the history of the CPC Central Committee on several issues ...Comrades: today brings together members, mainly in order to provide a platform to Exchange and learn from each other in order to facilitate our work. Just now, we focus on taxation, planning and stability, safety, project construction, typical topics such as private facts presentation and interaction, and towns currently exist in the in-depth analysis of the problems to be solved, to explore new methods to solve the problem. It can be said that summing up the achievement, no grandstanding; analysis数学试卷

第 3 页 （共6页）

( C )

D,2sin215?1 ( D ) D,?10 ( A ) D,sin?

( B )

D,ODA?2O

n to gradually plan development. Signs show that the new leadership began to make a left turn in politics. However, as of right nownot only ideological confusion in the community, the new leadership's thinking is messy. 两人成

( A ) d to implement the Constitution, stressed the need to turn off the power in a cage. profile shadow begaNew leaders both stressed the neepromotion of employment, form a reasonable and orderly pattern of income distribution, build a more fair and sustainable social security systems, medical and health system reform. The plenary, innovation of social governance, must focus on the maintenance of fundamental interests of the overwhelming majority of the people, maximize factors, enhance social development, improving social governance, the interests of national security, ensure that the people live and work, social stability and order. o improve social governance, stimulating social organization, innovative and effective system of preventing and resolving social conflicts, improving the public security system, set up the National Security Council, national security systems and national security strategy to ensure national security. Plenary session, the construction of ecological civilization, you must establish systems of ecological system, using the system to protect the ecological environment. o improve natural resources asset property right system and use control, red line of delimitation of ecological protection, resources paid use system and ecological compensation system in ecological environment protection management system reform. Plenary session, centering on building a listening party command, can win and having a fine style of the people's army, a strong army under the new situation of the party Goals, restricting the development of national defense and army building is solved outstanding contradictions and problems, innovation and development of military theory, enhance military strategic guidance, improve the military strategy in the new period, building a modern military force system with Chinese characteristics. o deepen the adjustment of personnel system reform in the army, military policy and system reform, promote the development of military and civilian integration depth. Plenary session stressed that comprehensive reform must be to strengthen and improve the party's leadership, give full play to the core role of the party commands the overall situation and coordinating all parties, improving the party's leading water ... Margin. Challenged the leadership of the Communist Party of China, Marxism-Leninism and Mao Zedong thought by Deng Xiao-ping's flag, replaced by three representatives and the harmonic society. The former Communist Party spirit and social cohesion point of almost all political makeover. Characteristics of socialism public ownership is shifting to private ownership, planned regulation and market regulation, the proletarian regime controlled by the elite. Of universal equality, fairness and basic principles of distribution system is socialist society, however after economic monopolized by powerful, vested interests grow, employers do not have the same status, hardly seems fair social distribution. State key protection of capital interests rather than the interests of citizens, had been hits the bottom of the proletariat

A B C D 16,如图,有一条长为a的斜坡AB,它的坡角为45,现保持坡高AC不 变,将坡角改为30,则斜坡AD的长为 ( B ) A,a B,2a C,3a D,2a

17,当a,b?R时,下列各式总能成立的是 ( B )

A,6(a?b)6?a?b B,4(a2?b24)?a2?b2 C,4a4?4b4?a?b D,3a2?3b2?a2?b2 18,已知x?0,y?0且x?y?1,则4x?1y的最小值是 ( C ) A,7 B,8 C,9 D,10 二,填空题:本大题共4小题,每小题4分,共16分,把答案填在题中的横线上 19,从甲,乙,丙三人中任选两名到一所乡村中学支教,甲被选中的概率是23 20,若fx()?sin(12x???)(||??2)的图象(部分)如图,则?的值是?6

21,已知过点A(?2,m)和B(m,4)的直线与直线2x?y??10垂直,则实数m的值是 2 22,设a,b,c均为正数,且(12)a?log1a,(1)b?log2b,2lc?og1c,则a,b,c之间的大小关系是 222c?a?b

bviously, face China's Socialist system, the Communist Party is not the party. In that case, political chaos has been very tight. Is remodeling or reconstruction, is a correction or a stove. Whether to turn right or left, is back to the source or put forward new political ideas. This is to determine the road problems in China, is also the key out of the deep water of the reform of the economic system. After 18, the new Central collective leadership attaches great importance to political orientation. First, the \s\ng from the Central Government's self-restraint, which preaches and pro-image, brought fresh feeling to the community. Secondly, before reform and opening up and reform and opening two periods after non-negative, untying the tangle of the society a long time on this issue. Third, a new generation of party leaders on various occasions to Mao Ze-Dong and Mao Ze-Dong's thought of evaluation has room for manoeuvre, through to the ruling ideology of Mao Zedong thought, is the call of the soul to the Socialist Revolution and construction. Empty talks jeopardize national interests aAlso stresses that Mao Zedong thought cannot be lost, 30 years after the reform and opening up 30 years ago can not deny each other. Both advocate democracy and release \does not speak of\constraints. Neither deny the history of the CPC Central Committee on several issues ...Comrades: today brings together members, mainly in order to provide a platform to Exchange and learn from each other in order to facilitate our work. Just now, we focus on taxation, planning and stability, safety, project construction, typical topics such as private facts presentation and interaction, and towns currently exist in the in-depth analysis of the problems to be solved, to explore new methods to solve the problem. It can be said that summing up the achievement, no grandstanding; analysis三,解答题:本大题共3小题,功30分,解答应写出文字说明,证明过程或演算步骤, 23(本小题满分10分)等差数列{a2n}中,且a2?2a4,求数列{an}的前10项的和S10. 【解:】设该数列的公差为d,故a2?a1?dd?2?,a4?a1?3d?2?3d 由a22?2a4得:(2)????d22(23d)d?0或d?2 当d?0时,S109?10?10a1?2d?20 当d?2时,S10??10a10?912d?10?2?10?92?2?110 故该数列的前10项和为20或110

24(本小题满分10分)如图,在棱长均为1的直三棱柱ABC?A1B1C1中,D,D1分别是BC,BC11的中点. (Ⅰ)求证:平面ABD11//平面AC1D; (Ⅱ)求异面直线AC1与BD1所成角的余弦值. 【解:】(Ⅰ)【证明:】(略) (Ⅱ)104

25(本小题满分10分)

某企业拟生产甲,乙两种产品,根据市场调研预测,甲产品的利润y与投资额x的算术平方根成正比,其关系如图一;乙产品的利润y与投资额x成正比,其关系如图二.

(Ⅰ)分别将甲,乙两种产品的的利润y表示为投资额x的函数关系式;

(Ⅱ)如果企业将筹集到的160万元资金全部投入到甲,乙两种产品的生产中,试问:怎样分配这160万元 的投资才能使该企业获得最大利润,最大利润是多少?

y甲?4xx(?0),y乙?14x(x?0) 甲投入64万元,乙投入96万元,获得最大利润56万元.

ffirmation of Deng Xiao-ping's reform ideas. These strong political signal showing a new generation of political leaders is still keeping to the Socialist road. Four is revisiting the \o Ze-Dong's historical cycle of\profile anti-corruption and the importance of the Constitution, reorganization is bad style of officialdom, was to civilize people obey the law, while improving the color change of the regime of vigilance. Five is to reform into deeper waters and stressed that top-level design, this is a review on the reform and opening up in the past, is also looking for a way out. Six foreign and Russia closer, the flexible attitude on the issue of the Korean peninsula, Sino-Japanese fishing hardline China on the island out of the \nt\ow profile shadow began to gradually plan development. Signs show that the new leadership began to make a left turn in politics. However, as of right now, not only ideological confusion in the community, the new leadership's thinking is messy. New leaders both stressed the need to implement the Constitution, stressed the need to turn off the power in a cage. nd try again, is an a