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cuteehuyen
2 năm trước
Câu 1: Cho hình bình hành ABCD. Gọi E là trung điểm của AB, F là trung điểm của CD. Chứng minh rằng DE = BF. Câu 2: Cho hình bình hành ABCD. Tia phân giác của góc A cắt CD ở M. Tia phân giác của góc C cắt AB tại N. Chứng minh rằng AMCN là hình bình hành.
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