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已知抛物线的顶点是,与y轴交点的纵坐标为2,则它的函数解析式为
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A.y=-3x2-2x+2
B.y=3x2+2x-2
C.y=-3x2+2x-2
D.y=-3x2-2x-2
若抛物线的顶点是(3,-1),且经过点(0,-4),则它的解析式是
A.y=x2-2x+4
B.y=-x2+2x-4
C.y=x2+2x-4
D.y=-x2-2x-4
A.
B.
C.
D.