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lethanh190973
2 năm trước
giúp mk , mk cần gấp mk vote 5 sao cho tam giác ABC cân tại A ( AB>BC ) . Vẽ BD vuông góc AC tại D , CE vuông góc AB tại E a) C/m tam giác DAB = tam giác EAC và tam giác ADE cân b) gọi H là giao điểm BD và CE . C/m AH là tia phân giác góc BAC . c) C/m AH > CH
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