问题描述: 解方程:3+1/2+(450-3x)/(x+0.2)=450/x 1个回答 分类:数学 2014-11-26 问题解答: 我来补答 3+1/2+(450-3x)/(x+0.2)=450/x 7/2+(450-3x)/(x+0.2)=450/x (7/2)x(x+0.2)+(450-3x)x=450(x+0.2)7/2x^2+7/10x+450x-3x^2=450x+901/2x^2+7/10x-90=05x^2+7X-900=0x1=12.73 x2=14.135 展开全文阅读