ǰλãҳ > 最新部编人教版四年级数学下册复习教?- 百度文库
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㡢㶨ɵĸϰ ƣ ѧ Ŀ꣺ ѧء ѵ㣺 ѧ ͶӰǣⵥ ѧ ڣ ͼ ʦ Ŀ꣩ ϰ ڣ1ʱ 1ͨϰ˳ȷ㡣 2ͨϰ㶨ɽм㡣 3븴ϰọ̈̄ͨȻγ֪ʶ硣 һ˳㶨ɽм ѧ ѧԤ裩 1ͬѧǻѧѧϰЩ֪ʶ ѧСڽܽ һ ̸ѧȷѧ2⣺Ϊܸõձѧѧϰ֪ʶϵͳϰڿϰ㶨ɵ֪ʶ 룬ϰĿ ϰ ʱ䣺3 ⣺㡢㶨ɵĸϰ ͨϰѧ1ϰӼͳ˳ּĹϵ ָѧ109ҳ1ѧɣСӼ˳弰ּĹϵ⡣ ʦһϰ ʱ䣺25 弰֮Ĺϵ ͨϰѧһ㣬˳ȷм㡣 ĵڣ12⡣ ʦʣӼ˳Ĺϵʲô ʦܽ 2ϰ㡣 ʾڣ3С⣬ѧʽֱгۺʽ ʦʣΪʲôʽʲôҪţ ʦȷŵǸı˳ﲻţҪֲʽӷҪš ʦ˭˵һ˵ʽ˳ָ˵ С˳˳Ӽġ 3ϰ㡣 ʾڣ4С⣬μʾССļ㷽ѧ˵һ˵Ƿֱʲô㶨ɡ ʦСֱõ˼ӷɡɺͳ˷ɡ ֱѧԺĸ ѧСɺֱ˵һ˵˳ڼʱҪעЩ⡣ ѧɲ ѧС齻ѧ㶨ɣԱʽܽᣬȻ㶨ɽм㡣 ͨʦͨһܽ㶨ɣѧڼ㶨ɽм㡣 ʾѧ㶨ɡʦʱ顣 4չϰ ָѧϰʮ6 ѧ˵һ˵ķֱЩ㶨ɡ ѧ㣬ɺڽֱЩ㶨ɡ ϰ ʱ䣺10 ڿΣǸϰйһϰ֪ʶ ָѧϰʮѧ 23⡣ ġС ʱ䣺2 ѧԸͼ֪ʶϰ֪ʶЩջ ϰѧ֪ʶϰ֪ н 㡢㶨ɸϰ ѧֱ˵һ˵Լջ ġ ûŵʽֻмӼֻг˳ҵμ㣻г˳ͼӼҪ˳ʽҪġ ӷɣa+b=b+a ˷ɣab=ba ӷɣa+b+c=a+(b+c) ˷ɣabc= a(bc) ʣa-b-c=a-(b+c) ˷ɣa(b+c)=ab+ac ʣabc=a(bc) 塢 ѧ Ŷ СͼӼĸϰ ƣ ϰ ڣ2ʱ 1ͨϰһ̶Сʶ⣬ܹʵʵѧ Ŀ꣺ ⡣ 2ܹСϵ֮IJͬ㣬ͨǨƺͶԱȣڹ֪ʶͬʱѧϰ飬ѧϰ 3ͨϰȷʶԼ֪ʶ״кͲ©ȱ ѧء ѵ㣺 ѧ ͶӰ ѧ ڣ ͼ ʦ Ŀ꣩ ѧԤ裩 ѧ Сͬ㣬С壬С֪ʶʵ⡣ һ ֱ뱾 ʦϽڿǸϰ ̸ϰ֪㶨ɵ֪ʶ 룬ʶٽѧڿҪϰСͼ ϰ ϰ״̬ ʱ䣺 ֪ʶ ⡣ ʦ̸븴ϰ ͨϰС1ϰλ˳ 䲢йСλʦλ˳ ָ˵һ˵Сλ˳λ֪ʶλ˳
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