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kaylin2709
2 năm trước
Tứ giác ABCD có E, F theo thứ tự là trung điểm của AD, BC a) Chứng minh EF nhỏ hơn hoặc bằng (AB+CD) : 2 b) Tứ giác ABCD có điều kiện gì thì EF=(AB+BC):2
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