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若双曲线-=1的渐近线与圆(x-3)2+y2=r2(r>0)相切,则r= .
若双曲线
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101222915587655973/SYS201311012229155876559013_ST/0.png)
-
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101222915587655973/SYS201311012229155876559013_ST/1.png)
=1的渐近线与圆(x-3)
2+y
2=r
2(r>0)相切,则r=
.
考点分析:
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