y=x^2-2(k-1)x+k^2的图像在x轴上截得线段长为根号2则|x1-x2|=根号2两边平方有（x1+x2)^2-4 x1 x2 =2对x^2-2(k-1)x+k^2=0 x1+x2=2(k-1) ,x1x2=k^2带入得 k=1/4原来抛物线方程为：y==x^2+3/2 x+1/16容易得出顶点坐标为...