求解3道立体几何题!尽快!1.棱长为1的正方体ABCD-A1B1C1D1 的8个顶点都在球O的表面上,点E F分别为棱AA1 DD1的中点,则直线EF被球O裁得的线段长为?2.若存在过点(1.0)的直线与曲线y=x^3 和y=ax^2 +15/4x -
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![求解3道立体几何题!尽快!1.棱长为1的正方体ABCD-A1B1C1D1 的8个顶点都在球O的表面上,点E F分别为棱AA1 DD1的中点,则直线EF被球O裁得的线段长为?2.若存在过点(1.0)的直线与曲线y=x^3 和y=ax^2 +15/4x -](/uploads/image/z/8921262-30-2.jpg?t=%E6%B1%82%E8%A7%A33%E9%81%93%E7%AB%8B%E4%BD%93%E5%87%A0%E4%BD%95%E9%A2%98%21%E5%B0%BD%E5%BF%AB%211.%E6%A3%B1%E9%95%BF%E4%B8%BA1%E7%9A%84%E6%AD%A3%E6%96%B9%E4%BD%93ABCD-A1B1C1D1+%E7%9A%848%E4%B8%AA%E9%A1%B6%E7%82%B9%E9%83%BD%E5%9C%A8%E7%90%83O%E7%9A%84%E8%A1%A8%E9%9D%A2%E4%B8%8A%2C%E7%82%B9E+F%E5%88%86%E5%88%AB%E4%B8%BA%E6%A3%B1AA1+DD1%E7%9A%84%E4%B8%AD%E7%82%B9%2C%E5%88%99%E7%9B%B4%E7%BA%BFEF%E8%A2%AB%E7%90%83O%E8%A3%81%E5%BE%97%E7%9A%84%E7%BA%BF%E6%AE%B5%E9%95%BF%E4%B8%BA%3F2.%E8%8B%A5%E5%AD%98%E5%9C%A8%E8%BF%87%E7%82%B9%EF%BC%881.0%EF%BC%89%E7%9A%84%E7%9B%B4%E7%BA%BF%E4%B8%8E%E6%9B%B2%E7%BA%BFy%3Dx%5E3+%E5%92%8Cy%3Dax%5E2+%2B15%2F4x+-)
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