如图,A,B是椭圆x^2/1+y^2/b^2=1(1>b>0)上两顶点,F是右焦点,若AB垂直于B如图,A,B是椭圆x^2/1+y^2/b^2=1(1>b>0)上两顶点,F是右焦点,若AB垂直于BF,则椭圆的焦距是
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![如图,A,B是椭圆x^2/1+y^2/b^2=1(1>b>0)上两顶点,F是右焦点,若AB垂直于B如图,A,B是椭圆x^2/1+y^2/b^2=1(1>b>0)上两顶点,F是右焦点,若AB垂直于BF,则椭圆的焦距是](/uploads/image/z/15035904-0-4.jpg?t=%E5%A6%82%E5%9B%BE%2CA%2CB%E6%98%AF%E6%A4%AD%E5%9C%86x%5E2%2F1%2By%5E2%2Fb%5E2%3D1%EF%BC%881%3Eb%3E0%EF%BC%89%E4%B8%8A%E4%B8%A4%E9%A1%B6%E7%82%B9%2CF%E6%98%AF%E5%8F%B3%E7%84%A6%E7%82%B9%2C%E8%8B%A5AB%E5%9E%82%E7%9B%B4%E4%BA%8EB%E5%A6%82%E5%9B%BE%2CA%2CB%E6%98%AF%E6%A4%AD%E5%9C%86x%5E2%2F1%2By%5E2%2Fb%5E2%3D1%EF%BC%881%26gt%3Bb%26gt%3B0%EF%BC%89%E4%B8%8A%E4%B8%A4%E9%A1%B6%E7%82%B9%2CF%E6%98%AF%E5%8F%B3%E7%84%A6%E7%82%B9%2C%E8%8B%A5AB%E5%9E%82%E7%9B%B4%E4%BA%8EBF%2C%E5%88%99%E6%A4%AD%E5%9C%86%E7%9A%84%E7%84%A6%E8%B7%9D%E6%98%AF)
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