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hieu6029
2 năm trước
cho tam giác ABC có BAC vuông=90độ.kẻ AH vuông góc với BC tại H.trên đường thẳng vuông góc với BC tại B lấy điểm D sao cho BD=AH a,chứng minh tam giác AHB=tam giác DBH b,chứng minh AB//DH c,tính ACB vuông biết BAH vuông=35 độ làm hộ e với e đang cần!!
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