如图,椭圆C:(a>b>0)的离心率为x^2/a^2+y^2/b^2=1,其左焦点到点P(2,1)的距离为.不过原点O的直线l与C相交于如图,椭圆C:(a>b>0)的离心率为x^2/a^2+y^2/b^2=1,其左焦点到点P(2,1)的距离为.不过原点O的直线l
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![如图,椭圆C:(a>b>0)的离心率为x^2/a^2+y^2/b^2=1,其左焦点到点P(2,1)的距离为.不过原点O的直线l与C相交于如图,椭圆C:(a>b>0)的离心率为x^2/a^2+y^2/b^2=1,其左焦点到点P(2,1)的距离为.不过原点O的直线l](/uploads/image/z/1670908-4-8.jpg?t=%E5%A6%82%E5%9B%BE%2C%E6%A4%AD%E5%9C%86C%3A%28a%3Eb%3E0%29%E7%9A%84%E7%A6%BB%E5%BF%83%E7%8E%87%E4%B8%BAx%5E2%2Fa%5E2%2By%5E2%2Fb%5E2%3D1%2C%E5%85%B6%E5%B7%A6%E7%84%A6%E7%82%B9%E5%88%B0%E7%82%B9P%282%2C1%29%E7%9A%84%E8%B7%9D%E7%A6%BB%E4%B8%BA.%E4%B8%8D%E8%BF%87%E5%8E%9F%E7%82%B9O%E7%9A%84%E7%9B%B4%E7%BA%BFl%E4%B8%8EC%E7%9B%B8%E4%BA%A4%E4%BA%8E%E5%A6%82%E5%9B%BE%2C%E6%A4%AD%E5%9C%86C%3A%28a%26gt%3Bb%26gt%3B0%29%E7%9A%84%E7%A6%BB%E5%BF%83%E7%8E%87%E4%B8%BAx%5E2%2Fa%5E2%2By%5E2%2Fb%5E2%3D1%2C%E5%85%B6%E5%B7%A6%E7%84%A6%E7%82%B9%E5%88%B0%E7%82%B9P%282%2C1%29%E7%9A%84%E8%B7%9D%E7%A6%BB%E4%B8%BA.%E4%B8%8D%E8%BF%87%E5%8E%9F%E7%82%B9O%E7%9A%84%E7%9B%B4%E7%BA%BFl)
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