抛物线y =-(x-1）²+1绕顶点旋转180度后变为y =(x-1）²+1,设y =(x-1）²+1上下平移b个单位,b可以为正数也可以为负数,正数代表上移,负数代表下移,则新抛物线为：y =(x-1）²+1+b.直线y=2x-3交于y轴...