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trungk4dc
2 năm trước
cho tam giác ABC vuông tại A (AB<AC) có M là trung điểm của cạnh BC .vẽ MD vuông góc với AB tại D và ME vuông góc với AC tại E a) chứng minh tứ giác ADME là hình chữ nhật b) chứng E là chung điểm cửa đoạn thẳng AC và tứ giác CMDElà hình bình hành
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