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理科第２２题别解７５１５０６宁夏盐池二中张洪福２３９０８０安徽滁州市施集中学谭玉明３２１４００浙江缙云中学胡挺员４２４４００湖南桂阳一中李钢骨试题如图，在正三棱柱ＡＢＣ—Ａ１Ｂ１Ｃ１中，Ｅ∈ＢＢ１，截面Ａ１ＥＣ⊥侧面ＡＣ１．（Ⅰ）求证：ＢＥ＝ＥＢ１；...
22th title of science course solution 751506 Ningxia Yanchi Erzhong Zhang Hongfu 239080 Anhui Bozhou City Shi Central School Tan Yuming 321400 Zhejiang Siyun Middle School Hutong 424400 Hunan Guiyang Yizhong Li Ganggu test Figure, in the positive triangular prism ABC—A1B1C1, E ∈BB1, section A1EC⊥ side AC1. (I) Proof: BE=EB1;...