(45% x + 15) / x = 60% x怎么解

问题描述:

(45% x + 15) / x = 60% x怎么解

45%x+15=60%xx
60%xx-45%x-15=0
60xx-45x-1500=0
4xx-3x-100=0
xx-3/4x-25=0
xx-3/4x+9/64-25-9/64=0
(x-3/8)*(x-3/8)=25+9/64
x-3/8=(25+9/64)开根号
x=(25+9/64)开根号+8/3