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thaiduiqn
2 năm trước
Cho tam giác ABC vuông tại A (AC<AB).Kẻ đường cao AH (H thuộc BC).Trên tia đối của ta HA lấy điểm D sao cho HA=HD a, CM tam giác ABD cân b,CM CD vuông góc BD c,lấy E thuộc BC sao cho H là trung điểm CE .CM DE vuông góc AB
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