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D 是垂足的條件不可少
Author:
hjyanghj
三角形
ABC中,
C為直角,
是邊
上的高,E、F分別是
ADC、
BDC的內心,E、F連線分別交
、
於G、H。 試證:
。 實驗:用下面的實驗來了解題目的性質,研判D可不可以放鬆條件為AB邊上的任一點,思考可能的證明方略。
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