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hoang571100
2 năm trước
cho tam giác ABC vuông tại A . Vẽ đường cao AH . trên nửa mặt phẳng bờ AB không chứa điểm H vẽ tia Ax sao cho góc BAx = góc BAH . Gọi tia AY là tia đối tia Ax . Vẽ BD và CE vuông góc với đường thẳng xy ( D , E thuộc xy ) . C/m a) tia AC là tia phân giác góc HAy b) BD+CE=BC và A là trung điểm DE c) HD vuông góc HE
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