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如图,在四棱锥P﹣ABCD中,底面ABCD是矩形,点E在棱PC上(异于点P,C),平面ABE与棱PD交于点F. (1)求证:AB∥EF; (2)若平面PAD⊥平面ABCD,求证:AF⊥EF.
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高一下学期数学《2017-2018学年黑龙江省牡丹江一中高一(下)期末数学试卷》真题及答案
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