发布时间 : 星期三 文章湖南省长沙市长郡中学2018-2019学年高一数学下学期期中试卷和答案更新完毕开始阅读
25.（本题满分8分）
如图，已知正方形ABCD和矩形ACEF所在的平面互相垂直，AB= EF的中点.
(1)求证：AM∥平面BDE； (2)求二面角A-DF-B的大小.
AF=1，M是线段
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