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(2007•重庆)附加题:用换元法解方程,若设y=x+,则原方程可化为( ) A...
(2007•重庆)附加题:用换元法解方程
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,若设y=x+
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/201310201202526548185770/SYS201310201202526548185006_ST/1.png)
,则原方程可化为( )
A.y
2-y+1=0
B.y
2+y+1=0
C.y
2+y-1=0
D.y
2-y-1=0
考点分析:
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