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已知圆M:x2+y2-2x-4y+1=0,则圆心M到直线(t为参数)的距离为 ....
已知圆M:x
2+y
2-2x-4y+1=0,则圆心M到直线
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123648884789904/SYS201310251236488847899010_ST/0.png)
(t为参数)的距离为
.
考点分析:
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