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thuydungthnn
2 năm trước
Bài 3. Cho hình bình hành ABCD tâm O. M, N, P, Q thuộc các cạnh AB, BC, CD, DA sao cho AM = BN = CP = DQ. 1) Chứng minh tứ giác BMDN là hình bình hành. 2) Chứng minh ba đường thẳng MP, NQ, AC đồng quy
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