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已知三棱柱ABC﹣A1B1C1的侧棱垂直于底面,∠BAC=90°,AB=AC=AA1=1,E、F分别是棱C1C、BC的中点. (Ⅰ)求证:B1F⊥平面AEF; (Ⅱ)求二面角F﹣B1E﹣A的大小...
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高一下学期数学《2017-2018学年黑龙江省哈尔滨三中高一(下)期末数学试卷》真题及答案
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