1.求过点(2,-1),圆心在直线y=-2x上,且和直线x-y=1相切的圆的方程.2.一个圆的圆心在直线2x+y=0上,且与两直线4x-3y+10=0和4x-3y-30=0都相切,求这个圆的方程.3.直线mx+ny-3=0和圆x平方+y平方+4x-1=0相切於点 (-
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![1.求过点(2,-1),圆心在直线y=-2x上,且和直线x-y=1相切的圆的方程.2.一个圆的圆心在直线2x+y=0上,且与两直线4x-3y+10=0和4x-3y-30=0都相切,求这个圆的方程.3.直线mx+ny-3=0和圆x平方+y平方+4x-1=0相切於点 (-](/uploads/image/z/5114970-18-0.jpg?t=1.%E6%B1%82%E8%BF%87%E7%82%B9%282%2C-1%29%2C%E5%9C%86%E5%BF%83%E5%9C%A8%E7%9B%B4%E7%BA%BFy%3D-2x%E4%B8%8A%2C%E4%B8%94%E5%92%8C%E7%9B%B4%E7%BA%BFx-y%3D1%E7%9B%B8%E5%88%87%E7%9A%84%E5%9C%86%E7%9A%84%E6%96%B9%E7%A8%8B.2.%E4%B8%80%E4%B8%AA%E5%9C%86%E7%9A%84%E5%9C%86%E5%BF%83%E5%9C%A8%E7%9B%B4%E7%BA%BF2x%2By%3D0%E4%B8%8A%2C%E4%B8%94%E4%B8%8E%E4%B8%A4%E7%9B%B4%E7%BA%BF4x-3y%2B10%3D0%E5%92%8C4x-3y-30%3D0%E9%83%BD%E7%9B%B8%E5%88%87%2C%E6%B1%82%E8%BF%99%E4%B8%AA%E5%9C%86%E7%9A%84%E6%96%B9%E7%A8%8B.3.%E7%9B%B4%E7%BA%BFmx%2Bny-3%3D0%E5%92%8C%E5%9C%86x%E5%B9%B3%E6%96%B9%2By%E5%B9%B3%E6%96%B9%2B4x-1%3D0%E7%9B%B8%E5%88%87%E6%96%BC%E7%82%B9+%28-)
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