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nquynhmai2010
2 năm trước
cho tam giác ABC có hai trung tuyến BD và CE cắt nhau tại G gọi M,N theo thứ tự là yrung điểm của BG vàCG a, Chứng minh tứ giác MNDE là hbh b. Tìm đk của tam giác ABC để MNDE là hcn
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