两个数学问题求解答一下1:一圆与Y轴相切,圆心在直线X-3Y=0上 此圆被直线Y=X截得弦长为2√7 球此圆的方程2:长方体ABCD——A1B1C1D1中 AB=AD=1 AA1=2 点P为DD1的中点(1)求证:直线BD平行于平面P
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![两个数学问题求解答一下1:一圆与Y轴相切,圆心在直线X-3Y=0上 此圆被直线Y=X截得弦长为2√7 球此圆的方程2:长方体ABCD——A1B1C1D1中 AB=AD=1 AA1=2 点P为DD1的中点(1)求证:直线BD平行于平面P](/uploads/image/z/13347113-41-3.jpg?t=%E4%B8%A4%E4%B8%AA%E6%95%B0%E5%AD%A6%E9%97%AE%E9%A2%98%E6%B1%82%E8%A7%A3%E7%AD%94%E4%B8%80%E4%B8%8B1%EF%BC%9A%E4%B8%80%E5%9C%86%E4%B8%8EY%E8%BD%B4%E7%9B%B8%E5%88%87%2C%E5%9C%86%E5%BF%83%E5%9C%A8%E7%9B%B4%E7%BA%BFX-3Y%3D0%E4%B8%8A+%E6%AD%A4%E5%9C%86%E8%A2%AB%E7%9B%B4%E7%BA%BFY%3DX%E6%88%AA%E5%BE%97%E5%BC%A6%E9%95%BF%E4%B8%BA2%E2%88%9A7+++%E7%90%83%E6%AD%A4%E5%9C%86%E7%9A%84%E6%96%B9%E7%A8%8B2%EF%BC%9A%E9%95%BF%E6%96%B9%E4%BD%93ABCD%E2%80%94%E2%80%94A1B1C1D1%E4%B8%AD+AB%3DAD%3D1++AA1%3D2+%E7%82%B9P%E4%B8%BADD1%E7%9A%84%E4%B8%AD%E7%82%B9%EF%BC%881%EF%BC%89%E6%B1%82%E8%AF%81%EF%BC%9A%E7%9B%B4%E7%BA%BFBD%E5%B9%B3%E8%A1%8C%E4%BA%8E%E5%B9%B3%E9%9D%A2P)
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