已知圆的方程是X²+Y²=4,直线L过点(2,-4) 当L与圆相交时,求直线L的斜率范围还有求过点(2,-4)的圆的切线方程
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![已知圆的方程是X²+Y²=4,直线L过点(2,-4) 当L与圆相交时,求直线L的斜率范围还有求过点(2,-4)的圆的切线方程](/uploads/image/z/1630858-58-8.jpg?t=%E5%B7%B2%E7%9F%A5%E5%9C%86%E7%9A%84%E6%96%B9%E7%A8%8B%E6%98%AFX%26%23178%3B%2BY%26%23178%3B%3D4%2C%E7%9B%B4%E7%BA%BFL%E8%BF%87%E7%82%B9%EF%BC%882%2C-4%EF%BC%89+%E5%BD%93L%E4%B8%8E%E5%9C%86%E7%9B%B8%E4%BA%A4%E6%97%B6%2C%E6%B1%82%E7%9B%B4%E7%BA%BFL%E7%9A%84%E6%96%9C%E7%8E%87%E8%8C%83%E5%9B%B4%E8%BF%98%E6%9C%89%E6%B1%82%E8%BF%87%E7%82%B9%EF%BC%882%EF%BC%8C-4%EF%BC%89%E7%9A%84%E5%9C%86%E7%9A%84%E5%88%87%E7%BA%BF%E6%96%B9%E7%A8%8B)
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