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(2010•金华)已知抛物线y=ax2+bx+c的开口向下,顶点坐标为(2,-3...
(2010•金华)已知抛物线y=ax2+bx+c的开口向下,顶点坐标为(2,-3),那么该抛物线有( )
A.最小值-3
B.最大值-3
C.最小值2
D.最大值2
考点分析:
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