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(2006•湖州)已知二次函数y=x2-bx+1(-1<b<1),在b从-1变化...
(2006•湖州)已知二次函数y=x2-bx+1(-1<b<1),在b从-1变化到1的过程中,它所对应的抛物线的位置也随之变化,下列关于抛物线的移动方向描述正确的是( )
A.先往左上方移动,再往左下方移动
B.先往左下方移动,再往左上方移动
C.先往右上方移动,再往右下方移动
D.先往右下方移动,再往右上方移动
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