1.六面体ABCD-A'B'C'D'中,AB=5,AD=3,AA'=7,角BAD=60度,角BAA'=角DAA'=45度,求AC'的长2.正方体ABCD-A'B'C'D'棱长为a,求A'B和B'C夹角.求证:A'B垂直于AC'
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![1.六面体ABCD-A'B'C'D'中,AB=5,AD=3,AA'=7,角BAD=60度,角BAA'=角DAA'=45度,求AC'的长2.正方体ABCD-A'B'C'D'棱长为a,求A'B和B'C夹角.求证:A'B垂直于AC'](/uploads/image/z/6834638-38-8.jpg?t=1.%E5%85%AD%E9%9D%A2%E4%BD%93ABCD-A%27B%27C%27D%27%E4%B8%AD%2CAB%3D5%2CAD%3D3%2CAA%27%3D7%2C%E8%A7%92BAD%3D60%E5%BA%A6%2C%E8%A7%92BAA%27%3D%E8%A7%92DAA%27%3D45%E5%BA%A6%2C%E6%B1%82AC%27%E7%9A%84%E9%95%BF2.%E6%AD%A3%E6%96%B9%E4%BD%93ABCD-A%27B%27C%27D%27%E6%A3%B1%E9%95%BF%E4%B8%BAa%2C%E6%B1%82A%27B%E5%92%8CB%27C%E5%A4%B9%E8%A7%92.%E6%B1%82%E8%AF%81%EF%BC%9AA%27B%E5%9E%82%E7%9B%B4%E4%BA%8EAC%27)
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