超超简单的相似三角形问题已知,在△ABC中,∠A=90°,AB=3,AC=4,MN‖BC,在BC上有一点P,使△MPN为等腰直角三角形,求MN的长!图在http://hiphotos.baidu.com/%DF%E4%C0%B2%D0%A1%CE%C4/pic/item/88edc423fcc39053ad34de14.jpg这一
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![超超简单的相似三角形问题已知,在△ABC中,∠A=90°,AB=3,AC=4,MN‖BC,在BC上有一点P,使△MPN为等腰直角三角形,求MN的长!图在http://hiphotos.baidu.com/%DF%E4%C0%B2%D0%A1%CE%C4/pic/item/88edc423fcc39053ad34de14.jpg这一](/uploads/image/z/5624221-13-1.jpg?t=%E8%B6%85%E8%B6%85%E7%AE%80%E5%8D%95%E7%9A%84%E7%9B%B8%E4%BC%BC%E4%B8%89%E8%A7%92%E5%BD%A2%E9%97%AE%E9%A2%98%E5%B7%B2%E7%9F%A5%2C%E5%9C%A8%E2%96%B3ABC%E4%B8%AD%2C%E2%88%A0A%3D90%C2%B0%2CAB%3D3%2CAC%3D4%2CMN%E2%80%96BC%2C%E5%9C%A8BC%E4%B8%8A%E6%9C%89%E4%B8%80%E7%82%B9P%2C%E4%BD%BF%E2%96%B3MPN%E4%B8%BA%E7%AD%89%E8%85%B0%E7%9B%B4%E8%A7%92%E4%B8%89%E8%A7%92%E5%BD%A2%2C%E6%B1%82MN%E7%9A%84%E9%95%BF%21%E5%9B%BE%E5%9C%A8http%3A%2F%2Fhiphotos.baidu.com%2F%25DF%25E4%25C0%25B2%25D0%25A1%25CE%25C4%2Fpic%2Fitem%2F88edc423fcc39053ad34de14.jpg%E8%BF%99%E4%B8%80)
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