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Mathematics, 31.07.2021 14:50 jarrettashlyn

Bài 9: Cho ∆ABC có AC > AB, trung tuyến AM. Trên tia đối của tia MA lấy điểm D sao cho MD = MA . Nối C với D
a. Chứng minh .Từ đó suy ra:

b. Kẻ đường cao AH. Gọi E là một điểm nằm giữa A và H. So sánh HC và
HB; EC và EB.

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Bài 9: Cho ∆ABC có AC > AB, trung tuyến AM. Trên tia đối của tia MA lấy điểm D sao cho MD = MA ....
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