已知直线l:y=kx+2(k为常数)过椭圆x2/a2+y2/b2=1(a>b>0)的上顶点B和左焦点F,直线l被圆x2+y2=4截得弦长d (1) 若d=2根号3,求k的值(2)若d≥五分之四倍根号5,求椭圆离心率的取值范围
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![已知直线l:y=kx+2(k为常数)过椭圆x2/a2+y2/b2=1(a>b>0)的上顶点B和左焦点F,直线l被圆x2+y2=4截得弦长d (1) 若d=2根号3,求k的值(2)若d≥五分之四倍根号5,求椭圆离心率的取值范围](/uploads/image/z/1022690-2-0.jpg?t=%E5%B7%B2%E7%9F%A5%E7%9B%B4%E7%BA%BFl%3Ay%3Dkx%2B2%28k%E4%B8%BA%E5%B8%B8%E6%95%B0%29%E8%BF%87%E6%A4%AD%E5%9C%86x2%2Fa2%2By2%2Fb2%3D1%28a%3Eb%3E0%29%E7%9A%84%E4%B8%8A%E9%A1%B6%E7%82%B9B%E5%92%8C%E5%B7%A6%E7%84%A6%E7%82%B9F%2C%E7%9B%B4%E7%BA%BFl%E8%A2%AB%E5%9C%86x2%2By2%3D4%E6%88%AA%E5%BE%97%E5%BC%A6%E9%95%BFd+%EF%BC%881%29+%E8%8B%A5d%3D2%E6%A0%B9%E5%8F%B73%2C%E6%B1%82k%E7%9A%84%E5%80%BC%EF%BC%882%EF%BC%89%E8%8B%A5d%E2%89%A5%E4%BA%94%E5%88%86%E4%B9%8B%E5%9B%9B%E5%80%8D%E6%A0%B9%E5%8F%B75%2C%E6%B1%82%E6%A4%AD%E5%9C%86%E7%A6%BB%E5%BF%83%E7%8E%87%E7%9A%84%E5%8F%96%E5%80%BC%E8%8C%83%E5%9B%B4)
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