一道高2空间向量的几何证明题,解答第一步已给出!在棱长为1的正方体ABCD-A’B’C’D’中,E,F分别为AB,BC的中点,试在棱B1B上找一点M,使得D1M⊥平面EFB1.正方体ABCD-A’B’C’D’中棱长为1设
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![一道高2空间向量的几何证明题,解答第一步已给出!在棱长为1的正方体ABCD-A’B’C’D’中,E,F分别为AB,BC的中点,试在棱B1B上找一点M,使得D1M⊥平面EFB1.正方体ABCD-A’B’C’D’中棱长为1设](/uploads/image/z/1580632-16-2.jpg?t=%E4%B8%80%E9%81%93%E9%AB%982%E7%A9%BA%E9%97%B4%E5%90%91%E9%87%8F%E7%9A%84%E5%87%A0%E4%BD%95%E8%AF%81%E6%98%8E%E9%A2%98%2C%E8%A7%A3%E7%AD%94%E7%AC%AC%E4%B8%80%E6%AD%A5%E5%B7%B2%E7%BB%99%E5%87%BA%21%E5%9C%A8%E6%A3%B1%E9%95%BF%E4%B8%BA1%E7%9A%84%E6%AD%A3%E6%96%B9%E4%BD%93ABCD-A%E2%80%99B%E2%80%99C%E2%80%99D%E2%80%99%E4%B8%AD%2CE%2CF%E5%88%86%E5%88%AB%E4%B8%BAAB%2CBC%E7%9A%84%E4%B8%AD%E7%82%B9%2C%E8%AF%95%E5%9C%A8%E6%A3%B1B1B%E4%B8%8A%E6%89%BE%E4%B8%80%E7%82%B9M%2C%E4%BD%BF%E5%BE%97D1M%E2%8A%A5%E5%B9%B3%E9%9D%A2EFB1.%E6%AD%A3%E6%96%B9%E4%BD%93ABCD-A%E2%80%99B%E2%80%99C%E2%80%99D%E2%80%99%E4%B8%AD%E6%A3%B1%E9%95%BF%E4%B8%BA1%E8%AE%BE)
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