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27 tháng 7 2017

c, Xét tm giác DIC VS tam giác DAB ta co :

CDI=DBA(SLT)

CID=ADB(SLT)

=> 2 TAM GIÁC ĐỒNG DẠNG

=> \(\dfrac{DI}{DB}\)=\(\dfrac{DC}{AB}\)

kéo dài MP cắt AD tại H

=> \(\dfrac{CP}{CB}\)=\(\dfrac{DC}{AB}\)( CÁI NÀY E TỰ CM , LỚP 8 HK OY)

=> \(\dfrac{DI}{DB}\)=\(\dfrac{CP}{CB}\)

=> IP// DC

=> M,I,P THẲNG HÀNG

=>DPCM.....

27 tháng 7 2017

ak mk lộn nha qua F vẽ đgt // vs AC cắt BD tại P

12 tháng 12 2019

https://hoc24.vn/

28 tháng 10 2018

dễ thek mà ko bt

29 tháng 4 2018

còn cần câu trả lời thì vẽ hình tớ coi thử. (có lẽ tớ sẽ giải được)

8 tháng 5 2018

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