如图,已知正方形ABCD的边长a,E是对角线BD上一点,BE=a,P是EC上任意一点,PM垂直BD于M,PN垂直BC于N,求PM+PN的值http://image.baidu.com/i?ct=503316480&z=0&tn=baiduimagedetail&word=%C8%E7%CD%BC%2C%D2%D1%D6%AA%D5%FD%B7%BD%D0%CEABCD%
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![如图,已知正方形ABCD的边长a,E是对角线BD上一点,BE=a,P是EC上任意一点,PM垂直BD于M,PN垂直BC于N,求PM+PN的值http://image.baidu.com/i?ct=503316480&z=0&tn=baiduimagedetail&word=%C8%E7%CD%BC%2C%D2%D1%D6%AA%D5%FD%B7%BD%D0%CEABCD%](/uploads/image/z/13419806-14-6.jpg?t=%E5%A6%82%E5%9B%BE%2C%E5%B7%B2%E7%9F%A5%E6%AD%A3%E6%96%B9%E5%BD%A2ABCD%E7%9A%84%E8%BE%B9%E9%95%BFa%2CE%E6%98%AF%E5%AF%B9%E8%A7%92%E7%BA%BFBD%E4%B8%8A%E4%B8%80%E7%82%B9%2CBE%3Da%2CP%E6%98%AFEC%E4%B8%8A%E4%BB%BB%E6%84%8F%E4%B8%80%E7%82%B9%2CPM%E5%9E%82%E7%9B%B4BD%E4%BA%8EM%2CPN%E5%9E%82%E7%9B%B4BC%E4%BA%8EN%2C%E6%B1%82PM%2BPN%E7%9A%84%E5%80%BChttp%3A%2F%2Fimage.baidu.com%2Fi%3Fct%3D503316480%26z%3D0%26tn%3Dbaiduimagedetail%26word%3D%25C8%25E7%25CD%25BC%252C%25D2%25D1%25D6%25AA%25D5%25FD%25B7%25BD%25D0%25CEABCD%25)
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