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(2000•安徽)用换元法解方程+=4,设y=,则原方程可变形为A.3y2+4y+1=0B...
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(2000•安徽)用换元法解方程
![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABwAAAAqCAYAAACgLjskAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
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RK5CYII=
)
+
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7yofAAAAAElFTkSuQmCC
)
=4,设y=
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RK5CYII=
)
,则原方程可变形为( )
A.3y
2+4y+1=0
B.3y
2-4y+1=0
C.y
2+3y-4=0
D.y
2-4y+3=0
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