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ngovantinh
2 năm trước
Cho tam giác ABC, vẽ AH vuông góc BC ( H thuộc BC), trên tia AH lấy D sao cho AH = HD. Cminh a, tam giác ABH = tam giác DBH b, AC=CD c, Qua A kẻ đường thẳng // với BD cắt BC tại E. Chứng minh H là trung điểm của BE Vẽ hình hộ mình với nhé
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