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抛物线的顶点坐标是( )
抛物线的顶点坐标是( ).
A.(2,-3) B.(-2,3) C.(2,3) D.(-2,-3)
抛物线的顶点坐标是( )
A.(3,1) B.(3,-1) C.(-3,1) D.(-3,-1)