解方程:15%+5%XX{500-X}=500X88%
问题描述：
解方程:15%+5%XX{500-X}=500X88%
答
15%x+5%x×（500-x）=500×88%
15x+5x×（500-x）=500×88
3x+x×（500-x）=100X88
3x+500x-x^2=100×88
x^2-503x+8800=0
x=(503±√217809)/2
x=(503±9√2689)/2