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phthanh205
2 năm trước
Cho ∆abc cân tại a. Kẻ bd vuông góc với ac, ce vuông góc với ab. Gọi o là giao điểm của bd và ce. A) cminh ∆adb=∆aec B) cminh ∆boc cân C) cminh ed//bc D) gọi m là trung điểm của bc. Cminh em=1/2 bc
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