如图,已知抛物线y1=-x²+bx+c过点A(1,0),点B(0,-2)两点,顶点为D.(1)求抛物线y1的解析式(2)将△AOB绕点A逆时针旋转90°后,得△AO‘B’,将抛物线y1沿对称轴平移后经过点B‘,求出平移后的

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