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quangdungmai37
2 năm trước
Cho tam giác ABC,M là một điểm bất kì trên BC,gọi E,F là thứ tự hình chiếu của B,C trên AM.a) cm tam giác ABM đồng dạng vơi FCM.b) khi M là trung điểm của BC.cm tứ giác DECF là hình bình hành
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