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KIMNGAN152
2 năm trước
Cho ΔABC vuông tại A (AB<AC), đường cao AH . Gọi D , E lần lượt là hình chiếu vuông góc của H lên `AB` và `AC` . a, Chứng minh : `AB``.``AD` `=` `AC``.``AE` b, Chững minh: `[(AB)/(AC)]^2` `=` `(BH)/(CH)`
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