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用换元法解分式方程+=3时,设,则原方程可变形为A.y2-3y+1=0B.y2+3y+1=...
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用换元法解分式方程
+
=3时,设
,则原方程可变形为( )
A.y
2-3y+1=0
B.y
2+3y+1=0
C.y
2+3y-1=0
D.y
2-y+3=0
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