在长方体ABCD-A'B'C'D'中,点P∈BB'(不与B、B'重合).PA∩BA'=M PC∩BC'=N,求证MN//平面ABCD在长方体ABCD-A'B'C'D'中,点P∈BB'(不与B、B'重合).PA∩BA'=M PC∩BC'=N,求证MN//平面ABCD
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![在长方体ABCD-A'B'C'D'中,点P∈BB'(不与B、B'重合).PA∩BA'=M PC∩BC'=N,求证MN//平面ABCD在长方体ABCD-A'B'C'D'中,点P∈BB'(不与B、B'重合).PA∩BA'=M PC∩BC'=N,求证MN//平面ABCD](/uploads/image/z/11269709-53-9.jpg?t=%E5%9C%A8%E9%95%BF%E6%96%B9%E4%BD%93ABCD-A%27B%27C%27D%27%E4%B8%AD%2C%E7%82%B9P%E2%88%88BB%27%28%E4%B8%8D%E4%B8%8EB%E3%80%81B%27%E9%87%8D%E5%90%88%29.PA%E2%88%A9BA%27%3DM++PC%E2%88%A9BC%27%3DN%2C%E6%B1%82%E8%AF%81MN%2F%2F%E5%B9%B3%E9%9D%A2ABCD%E5%9C%A8%E9%95%BF%E6%96%B9%E4%BD%93ABCD-A%27B%27C%27D%27%E4%B8%AD%2C%E7%82%B9P%E2%88%88BB%27%EF%BC%88%E4%B8%8D%E4%B8%8EB%E3%80%81B%27%E9%87%8D%E5%90%88%EF%BC%89.PA%E2%88%A9BA%27%3DM+++PC%E2%88%A9BC%27%3DN%2C%E6%B1%82%E8%AF%81MN%2F%2F%E5%B9%B3%E9%9D%A2ABCD)
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