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conglylon810
1 năm trước
Cho hình chữ nhật ABCD ( AD <AB) gọi Ở là giao điểm hai đg chéo . Kẻ đường thẳng d vuông góc vs OB tại D . Đ cắt tia BC tại E a, CM tam giác DBE đồng dạng với tam giác CDE b, kẻ CH vuông góc vs DE tại H . Cm DC2 =CH .DB C, gọi là giao đ của OE và HC .CM k là trung đ của HC d, CM ba đg thẳng OE , DC,BH đồng quy Lm hộ e vs ạ
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