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ǰλãҳ > 北师大版高考数??大一轮复?--第八? 8.5--(附答? - 百度文库

北师大版高考数??大一轮复?--第八? 8.5--(附答? - 百度文库

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  • 2025/5/5 2:57:23

һ ˼

1жнǷȷ(д򡰡̡򡰡) (1)ֱlƽڵֱ߶ֱlͦ.( ) (2)ֱͬһƽƽƽУ( ) (3)ֱaͦbͦab.( ) (4)ͦ£aͦ£aΦ.( )

(5)ֱaƽֱbΦֱabֱ( )

(6)ƽڵһֱߴֱƽڵֱߣͦ.( ) ̲ĸı

2д( )

Aƽƽ£ôƽһֱƽƽ

Bƽֱƽ£ôƽһֱߴֱƽ Cƽƽãƽ¡ƽãɦ£lôlƽ

ʵĵ

5

Dƽƽ£ôƽֱ߶ֱƽ D

Dƽƽ£ƽڵֱ߿ֱܲƽ£ƽµĹϵбƽлƽڣѡȷģ

3׶PABCУPƽABCеӰΪO. (1)PAPBPCOǡABC________ģ

(2)PAPBPBPCPCPAOǡABC________ģ (1) (2)

(1)ͼ1OAOBOCOP

RtPOARtPOBRtPOCУPAPCPB

OAOBOCOΪABCģ

(2)ͼ2ӳAOBOCOֱBCACABHDG.

ʵĵ 6

PCPAPBPCPAPBP

PCƽPAB

ABƽPABPCAB

ABPOPOPCP

ABƽPGCCGƽPGC

ABCGCGΪABCABϵĸߣ

֤ͬBDAHֱΪABCACBCϵĸߣ

OΪABCĴģ

״Ծ

4(2017У)֪mnֱͬߣͦغϵƽ棬иһƳmͦµ( ) Aͦm

BͦmΦ

ʵĵ

7

Cmnnͦ C

DmnҦΦ

洹ֱж֪Cȷ

5.ͼʾABCDA1B1C1D1УOMNֱ߶BDDD1D1C1е㣬ֱOMACMNλùϵ( )

AACMNֱ BACֱMNֱ CACֱMNֱ DACMNֱ A

ΪDD1ƽABCDACDD1

ΪACBDDD1BDD

ACƽBDD1B1

ʵĵ

8

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һ ˼ 1жнǷȷ(д򡰡̡򡰡) (1)ֱlƽڵֱ߶ֱlͦ.( ) (2)ֱͬһƽƽƽУ( ) (3)ֱaͦbͦab.( ) (4)ͦ£aͦ£aΦ.( ) (5)ֱaƽֱbΦֱabֱ( ) (6)ƽڵһֱߴֱƽڵֱߣͦ.( ) ̲ĸı 2д( ) Aƽƽ£ôƽһֱƽƽ Bƽֱƽ£ôƽһֱߴֱƽ Cƽƽãƽ¡ƽãɦ£lôlƽ ʵĵ

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