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(2006•舟山)已知反比例函数的图象经过点(-2,1),则反比例函数的表达式为...
(2006•舟山)已知反比例函数的图象经过点(-2,1),则反比例函数的表达式为( )
A.y=-
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131019110319451049021/SYS201310191103194510490006_ST/0.png)
B.y=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131019110319451049021/SYS201310191103194510490006_ST/1.png)
C.y=-
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131019110319451049021/SYS201310191103194510490006_ST/2.png)
D.y=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131019110319451049021/SYS201310191103194510490006_ST/3.png)
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