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(2000•杭州)方程,如果设,那么原方程就变为A.y2+2y+3=0B.y2+2y-3=...
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(2000•杭州)方程
,如果设
,那么原方程就变为( )
A.y
2+2y+3=0
B.y
2+2y-3=0
C.2y
2+y+3=0
D.2y
2+y-3=0
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