PA垂直与矩形ABCD所在的平面,E,F分别是AB,PD,的中点,(1)求证:AF//平面PCE?(2)若二面角P-CD-B=45度,求二面角E-PC-D的大小?
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![PA垂直与矩形ABCD所在的平面,E,F分别是AB,PD,的中点,(1)求证:AF//平面PCE?(2)若二面角P-CD-B=45度,求二面角E-PC-D的大小?](/uploads/image/z/2788213-13-3.jpg?t=PA%E5%9E%82%E7%9B%B4%E4%B8%8E%E7%9F%A9%E5%BD%A2ABCD%E6%89%80%E5%9C%A8%E7%9A%84%E5%B9%B3%E9%9D%A2%2CE%2CF%E5%88%86%E5%88%AB%E6%98%AFAB%2CPD%2C%E7%9A%84%E4%B8%AD%E7%82%B9%2C%EF%BC%881%EF%BC%89%E6%B1%82%E8%AF%81%EF%BC%9AAF%2F%2F%E5%B9%B3%E9%9D%A2PCE%3F%282%29%E8%8B%A5%E4%BA%8C%E9%9D%A2%E8%A7%92P-CD-B%3D45%E5%BA%A6%2C%E6%B1%82%E4%BA%8C%E9%9D%A2%E8%A7%92E-PC-D%E7%9A%84%E5%A4%A7%E5%B0%8F%3F)
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