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Casiododaihoc
2 năm trước
Cho tam giác ABC, D là trung điểm AC, A vẽ đường thẳng song song BC. Trên cạnh BC lấy điểm M sao cho MD cắt AE tại N. a. Chứng minh: AE = BC b. Chứng minh: D là trung điểm của MN c. Chứng minh: AB//EC
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