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若双曲线x2-y2=1的右支上一点P(a,b)到直线y=x的距离为,则a+b的值...
若双曲线x
2-y
2=1的右支上一点P(a,b)到直线y=x的距离为
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225934374782549/SYS201311012259343747825010_ST/0.png)
,则a+b的值为( )
A.-
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225934374782549/SYS201311012259343747825010_ST/1.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225934374782549/SYS201311012259343747825010_ST/2.png)
C.±
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225934374782549/SYS201311012259343747825010_ST/3.png)
D.±2
考点分析:
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