已知x^2/a^2+y^2/b^2(a>b>0)的长轴长是短轴长的根号3倍,焦距为2根号21.求椭圆方程(算出来了)2.若直线y=x+1/2交椭圆于PQ两点,求证点B(0,-b)在以PQ为直径的圆上.(连立方程算不出来了)
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![已知x^2/a^2+y^2/b^2(a>b>0)的长轴长是短轴长的根号3倍,焦距为2根号21.求椭圆方程(算出来了)2.若直线y=x+1/2交椭圆于PQ两点,求证点B(0,-b)在以PQ为直径的圆上.(连立方程算不出来了)](/uploads/image/z/10291758-6-8.jpg?t=%E5%B7%B2%E7%9F%A5x%5E2%2Fa%5E2%2By%5E2%2Fb%5E2%EF%BC%88a%EF%BC%9Eb%EF%BC%9E0%EF%BC%89%E7%9A%84%E9%95%BF%E8%BD%B4%E9%95%BF%E6%98%AF%E7%9F%AD%E8%BD%B4%E9%95%BF%E7%9A%84%E6%A0%B9%E5%8F%B73%E5%80%8D%2C%E7%84%A6%E8%B7%9D%E4%B8%BA2%E6%A0%B9%E5%8F%B721.%E6%B1%82%E6%A4%AD%E5%9C%86%E6%96%B9%E7%A8%8B%EF%BC%88%E7%AE%97%E5%87%BA%E6%9D%A5%E4%BA%86%EF%BC%892.%E8%8B%A5%E7%9B%B4%E7%BA%BFy%3Dx%2B1%2F2%E4%BA%A4%E6%A4%AD%E5%9C%86%E4%BA%8EPQ%E4%B8%A4%E7%82%B9%2C%E6%B1%82%E8%AF%81%E7%82%B9B%EF%BC%880%2C-b%EF%BC%89%E5%9C%A8%E4%BB%A5PQ%E4%B8%BA%E7%9B%B4%E5%BE%84%E7%9A%84%E5%9C%86%E4%B8%8A.%EF%BC%88%E8%BF%9E%E7%AB%8B%E6%96%B9%E7%A8%8B%E7%AE%97%E4%B8%8D%E5%87%BA%E6%9D%A5%E4%BA%86%EF%BC%89)
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