问题描述: x^3-5x^2+5x+5=0 1个回答 分类:数学 2014-12-09 问题解答: 我来补答 x^3-5x^2 5x 5=0这是个一元三次方程,用盛金公式得三个根:x1=(5-(100^(1/3) 10^(1/3))/3x2=(5 sin30°[100^(1/3) 10^(1/3)] cos30°[100^(1/3)-10^(1/3)]i)/3x3=(5 sin30°[100^(1/3) 10^(1/3)]-cos30°[100^(1/3)-10^(1/3)]i)/3 展开全文阅读