已知圆C:x2+y2+6x+8y+21=0,抛物线y2=8x的准线为l,设抛物线上任意一点P到直线l的距离为m,
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![已知圆C:x2+y2+6x+8y+21=0,抛物线y2=8x的准线为l,设抛物线上任意一点P到直线l的距离为m,](/uploads/image/z/10230503-23-3.jpg?t=%E5%B7%B2%E7%9F%A5%E5%9C%86C%EF%BC%9Ax2%2By2%2B6x%2B8y%2B21%3D0%2C%E6%8A%9B%E7%89%A9%E7%BA%BFy2%3D8x%E7%9A%84%E5%87%86%E7%BA%BF%E4%B8%BAl%2C%E8%AE%BE%E6%8A%9B%E7%89%A9%E7%BA%BF%E4%B8%8A%E4%BB%BB%E6%84%8F%E4%B8%80%E7%82%B9P%E5%88%B0%E7%9B%B4%E7%BA%BFl%E7%9A%84%E8%B7%9D%E7%A6%BB%E4%B8%BAm%2C)
已知圆C:x2+y2+6x+8y+21=0,抛物线y2=8x的准线为l,设抛物线上任意一点P到直线l的距离为m,
已知圆C:x2+y2+6x+8y+21=0,抛物线y2=8x的准线为l,设抛物线上任意一点P到直线l的距离为m,
已知圆C:x2+y2+6x+8y+21=0,抛物线y2=8x的准线为l,设抛物线上任意一点P到直线l的距离为m,
圆C:x2+y2+6x+8y+21=(x+3)^2+(y+4)^2-4=0
(x+3)^2+(y+4)^2=4,圆心(-3,-4),半径2.
抛物线y2=8x,x=y^2/8,
圆心C不在抛物线的内部.