假设三个根x1,x2,x3则方程:(x-x1)(x-x2)(x-x3)=0整理得：x^3-(x1+x2+x3)x^2+(x1x2+x2x3+x1x3)x-x1x2x3=0即:3x^3-3x^2+3x+1=0结果用计算器算：x1≈-0.253077x2≈0.626538-0.961548ix3≈0.626538+0.961548i此方程的近...
