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(2005•南通)用换元法解方程x2-2x+=8,若设x2-2x=y,则原方程化为关于y的...
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(2005•南通)用换元法解方程x
2-2x+
=8,若设x
2-2x=y,则原方程化为关于y的整式方程是( )
A.y
2+8y-7=0
B.y
2-8y-7=0
C.y
2+8y+7=0
D.y
2-8y+7=0
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