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thaolinhkute.2k2
2 năm trước
Cho tam giác ABC có góc A nhọn, AB=AC. Kẻ CD vuông góc AB(D thuộc AB), kẻ BE vuông góc AC( E thuộc AC). Gọi O là giao điểm BE và CD. CM a)BE=CD b)OD=0E và OB=OC c) AO là phân giác của góc BAC
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