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2 năm trước
Cho hình thang ABCD ( AB song song CD, AB < CD ). Gọi M, N, E, F lần lượt là trung điểm AD, BC, AC, BD. Chứng minh a. 4 điểm M,N,E,F thẳng hàng b. MF = NE c. EF = 1/2 ( DC - AB)
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