一个多面体的三视图及直观图如图所示,M,N分别是A1B,B1C1的中点.(1)求证:MN‖平面ACC1A1; (2)求
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![一个多面体的三视图及直观图如图所示,M,N分别是A1B,B1C1的中点.(1)求证:MN‖平面ACC1A1; (2)求](/uploads/image/z/9908789-5-9.jpg?t=%E4%B8%80%E4%B8%AA%E5%A4%9A%E9%9D%A2%E4%BD%93%E7%9A%84%E4%B8%89%E8%A7%86%E5%9B%BE%E5%8F%8A%E7%9B%B4%E8%A7%82%E5%9B%BE%E5%A6%82%E5%9B%BE%E6%89%80%E7%A4%BA%2CM%2CN%E5%88%86%E5%88%AB%E6%98%AFA1B%2CB1C1%E7%9A%84%E4%B8%AD%E7%82%B9.%EF%BC%881%EF%BC%89%E6%B1%82%E8%AF%81%EF%BC%9AMN%E2%80%96%E5%B9%B3%E9%9D%A2ACC1A1%EF%BC%9B+%EF%BC%882%EF%BC%89%E6%B1%82)
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