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Casiododaihoc
2 năm trước
Cho tam giác ABC. Gọi D,M,E theo thứ tự là trung điểm của AB,BC,CA. Đường cao AH a) Chứng minh tứ giác ADME là hình bình hành b) Để tứ giác ADME là hình vuông thì tam giác ABC cần có thêm điều kiện gì? c) Chứng minh ED là phân giác của góc AEH
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