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long2003
2 năm trước
cho tam giác abc cân có ab=ac = 5cm , bc = 8cm . kẻ ah vuông góc với bc tại h. a) cm hb=hc và góc bah = góc cah b ) tính độ dài ah c) kẻ hd vuông góc với ab, kẻ he vuông góc với ac .. chứng minh tam giác hde là tam giác cân
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