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(2004•衢州)已知方程x2-5x=2-,用换元法解此方程时,可设y=,则原方程化为A....
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(2004•衢州)已知方程x
2-5x=2-
,用换元法解此方程时,可设y=
,则原方程化为( )
A.y
2-y+2=0
B.y
2-y-2=0
C.y
2+y-2=0
D.y
2+y+2=0
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