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用换元法解方程,令,代入原方程后,变形正确的为A.y2+5=0B.y2-6y=0C.(y+...
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用换元法解方程
![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAIUAAAAjCAYAAAC6n8nPAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
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Aed/vqHCfj9UAAAAAElFTkSuQmCC
)
,令
![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAADEAAAAjCAYAAAA9guKMAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
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AElFTkSuQmCC
)
,代入原方程后,变形正确的为( )
A.y
2+5=0
B.y
2-6y=0
C.(y+1)(y+5)=0
D.(y-1)(y-5)=0
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