[Trang Ánh Nam] New comment on Ôn thi Tuyển Sinh 10 - Phần Hình Học.

Nam Trang Ánh has left a new comment on your post "Ôn thi Tuyển Sinh 10 - Phần Hình Học":

TP.HCM năm 2017-2018

Cho tam giác ABC vuông tại A. Đường tròn tâm O đường kính AB, cắt đoạn BC và OC lận lượt tại D và I. Gọi H là hình chiếu của A lên OC; AH cắt BC tại M.
a) Chứng minh: tứ giác ACDH nội tiếp và góc CHD=góc ABC
b) CHứng minh: hai tam giác OHB và OBC đồng dạng với nhau và HM là tia phân giác của góc BHD.
c) gọi K là trung điểm của của BD. CHứng minh MD.BC=MB.CD và MB.MD=MK.MC
d) Gọi E là giao điểm của AM và OK; J là giao điểm của IM và (O) (J khác I). CHứng Minh: hai đường thẳng OC và EJ cắt nhau tại một điểm trên (O).

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Posted by Nam Trang Ánh to Trang Ánh Nam at December 25, 2018 at 2:57 AM

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