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thanhcute0109
2 năm trước
Cho tam giác ABC. Gọi D, M, E theo thứ tự là trung điểm của AB, BC, CA. a) Chứng minh tứ giác ADME là hình bình hành b) Tam giác ABC có điều kiện gì thì tứ giác ADME là hình chữ nhật
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