人教版数学必修二第二章复习题B组1、2题答案1.边长为2的正方形ABCD中,(1)点E是AB的中点,点F是BC的中点,将△AED,△DCF分别沿DE,DF折起,使A,C两点重合于点A'.求证:A'D⊥EF.(2)当BE=BF=四分之一BC
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![人教版数学必修二第二章复习题B组1、2题答案1.边长为2的正方形ABCD中,(1)点E是AB的中点,点F是BC的中点,将△AED,△DCF分别沿DE,DF折起,使A,C两点重合于点A'.求证:A'D⊥EF.(2)当BE=BF=四分之一BC](/uploads/image/z/2656123-43-3.jpg?t=%E4%BA%BA%E6%95%99%E7%89%88%E6%95%B0%E5%AD%A6%E5%BF%85%E4%BF%AE%E4%BA%8C%E7%AC%AC%E4%BA%8C%E7%AB%A0%E5%A4%8D%E4%B9%A0%E9%A2%98B%E7%BB%841%E3%80%812%E9%A2%98%E7%AD%94%E6%A1%881.%E8%BE%B9%E9%95%BF%E4%B8%BA2%E7%9A%84%E6%AD%A3%E6%96%B9%E5%BD%A2ABCD%E4%B8%AD%2C%EF%BC%881%EF%BC%89%E7%82%B9E%E6%98%AFAB%E7%9A%84%E4%B8%AD%E7%82%B9%2C%E7%82%B9F%E6%98%AFBC%E7%9A%84%E4%B8%AD%E7%82%B9%2C%E5%B0%86%E2%96%B3AED%2C%E2%96%B3DCF%E5%88%86%E5%88%AB%E6%B2%BFDE%2CDF%E6%8A%98%E8%B5%B7%2C%E4%BD%BFA%2CC%E4%B8%A4%E7%82%B9%E9%87%8D%E5%90%88%E4%BA%8E%E7%82%B9A%27.%E6%B1%82%E8%AF%81%EF%BC%9AA%27D%E2%8A%A5EF.%EF%BC%882%EF%BC%89%E5%BD%93BE%3DBF%3D%E5%9B%9B%E5%88%86%E4%B9%8B%E4%B8%80BC)
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