如图(图片已上存):四棱锥p-ABCD的底面为矩形,它的直观图,三视图中的正视图,侧视图如图所示.接上:若E为四棱锥P-ABCD的棱PC上任意一点,且PE/EC=m,试问在棱PB上是否存在一点F,使得DE//平面FAC?
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![如图(图片已上存):四棱锥p-ABCD的底面为矩形,它的直观图,三视图中的正视图,侧视图如图所示.接上:若E为四棱锥P-ABCD的棱PC上任意一点,且PE/EC=m,试问在棱PB上是否存在一点F,使得DE//平面FAC?](/uploads/image/z/11693151-63-1.jpg?t=%E5%A6%82%E5%9B%BE%EF%BC%88%E5%9B%BE%E7%89%87%E5%B7%B2%E4%B8%8A%E5%AD%98%EF%BC%89%EF%BC%9A%E5%9B%9B%E6%A3%B1%E9%94%A5p-ABCD%E7%9A%84%E5%BA%95%E9%9D%A2%E4%B8%BA%E7%9F%A9%E5%BD%A2%2C%E5%AE%83%E7%9A%84%E7%9B%B4%E8%A7%82%E5%9B%BE%2C%E4%B8%89%E8%A7%86%E5%9B%BE%E4%B8%AD%E7%9A%84%E6%AD%A3%E8%A7%86%E5%9B%BE%2C%E4%BE%A7%E8%A7%86%E5%9B%BE%E5%A6%82%E5%9B%BE%E6%89%80%E7%A4%BA.%E6%8E%A5%E4%B8%8A%EF%BC%9A%E8%8B%A5E%E4%B8%BA%E5%9B%9B%E6%A3%B1%E9%94%A5P-ABCD%E7%9A%84%E6%A3%B1PC%E4%B8%8A%E4%BB%BB%E6%84%8F%E4%B8%80%E7%82%B9%2C%E4%B8%94PE%2FEC%3Dm%2C%E8%AF%95%E9%97%AE%E5%9C%A8%E6%A3%B1PB%E4%B8%8A%E6%98%AF%E5%90%A6%E5%AD%98%E5%9C%A8%E4%B8%80%E7%82%B9F%2C%E4%BD%BF%E5%BE%97DE%2F%2F%E5%B9%B3%E9%9D%A2FAC%3F)
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