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quockhanh20012001
2 năm trước
Cho tam giác ABC . Trên tia đối của tia AB lấy D sao cho AD=AB, trên tia đối của tia AC lấy điểm E sao cho AE=CD a) CMR:BE=CD b) CM: BE//CD c) gọi M là trung điểm của BE và N là trung điểm của CD. CM AM=AN
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