如图,在△ABC中,AB=AC,P为BC上任意一点,且PE⊥AC于E,PD⊥AB于D,CM为AB边上的高1.求证 PD+PE=CM2 若点P在BC的延长线上,PD,PE,CM又有怎样的关系?请证明最好有理由
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![如图,在△ABC中,AB=AC,P为BC上任意一点,且PE⊥AC于E,PD⊥AB于D,CM为AB边上的高1.求证 PD+PE=CM2 若点P在BC的延长线上,PD,PE,CM又有怎样的关系?请证明最好有理由](/uploads/image/z/1600797-21-7.jpg?t=%E5%A6%82%E5%9B%BE%2C%E5%9C%A8%E2%96%B3ABC%E4%B8%AD%2CAB%3DAC%2CP%E4%B8%BABC%E4%B8%8A%E4%BB%BB%E6%84%8F%E4%B8%80%E7%82%B9%2C%E4%B8%94PE%E2%8A%A5AC%E4%BA%8EE%2CPD%E2%8A%A5AB%E4%BA%8ED%2CCM%E4%B8%BAAB%E8%BE%B9%E4%B8%8A%E7%9A%84%E9%AB%981.%E6%B1%82%E8%AF%81+PD%2BPE%3DCM2+%E8%8B%A5%E7%82%B9P%E5%9C%A8BC%E7%9A%84%E5%BB%B6%E9%95%BF%E7%BA%BF%E4%B8%8A%2CPD%2CPE%2CCM%E5%8F%88%E6%9C%89%E6%80%8E%E6%A0%B7%E7%9A%84%E5%85%B3%E7%B3%BB%3F%E8%AF%B7%E8%AF%81%E6%98%8E%E6%9C%80%E5%A5%BD%E6%9C%89%E7%90%86%E7%94%B1)
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