动圆c的方程为x²+y²+2ax-4ay+5=0.(1)若a=2,且直线y=3x与圆c交与A,B两点,求弦长丨AB丨(2)求动圆圆心c的轨迹方程(3)若直线y=kx-2k与动圆圆心c的轨迹有公共点,求k的取值范围
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![动圆c的方程为x²+y²+2ax-4ay+5=0.(1)若a=2,且直线y=3x与圆c交与A,B两点,求弦长丨AB丨(2)求动圆圆心c的轨迹方程(3)若直线y=kx-2k与动圆圆心c的轨迹有公共点,求k的取值范围](/uploads/image/z/5938870-22-0.jpg?t=%E5%8A%A8%E5%9C%86c%E7%9A%84%E6%96%B9%E7%A8%8B%E4%B8%BAx%26%23178%3B%2By%26%23178%3B%2B2ax-4ay%2B5%3D0.%281%29%E8%8B%A5a%3D2%2C%E4%B8%94%E7%9B%B4%E7%BA%BFy%3D3x%E4%B8%8E%E5%9C%86c%E4%BA%A4%E4%B8%8EA%2CB%E4%B8%A4%E7%82%B9%2C%E6%B1%82%E5%BC%A6%E9%95%BF%E4%B8%A8AB%E4%B8%A8%282%29%E6%B1%82%E5%8A%A8%E5%9C%86%E5%9C%86%E5%BF%83c%E7%9A%84%E8%BD%A8%E8%BF%B9%E6%96%B9%E7%A8%8B%283%29%E8%8B%A5%E7%9B%B4%E7%BA%BFy%3Dkx-2k%E4%B8%8E%E5%8A%A8%E5%9C%86%E5%9C%86%E5%BF%83c%E7%9A%84%E8%BD%A8%E8%BF%B9%E6%9C%89%E5%85%AC%E5%85%B1%E7%82%B9%2C%E6%B1%82k%E7%9A%84%E5%8F%96%E5%80%BC%E8%8C%83%E5%9B%B4)
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