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Hoanglegiang3004
2 năm trước
câu 1:cho hình bình hành ABCD gọi E là trung điểm của A,B,F là trung điểm của CD Chứng minh rằng DE ,BF là hình bình hành câu 2: cho hình bình hành .Gọi I,K theo thứ tự là trung điểm của CD,AB . Đường chéo BD cắt AI ,CK theo tứ tự ở E ,F chứng minh rằng DE=EF=FB
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