解方程:(1-20%)* 4/(4+3+2) x = 80

问题描述:

解方程:(1-20%)* 4/(4+3+2) x = 80

225

(1-20%)* 4/(4+3+2) x = 80
(1-20%)* 4/80=(4+3+2) x
0.04=9x
x=225

(1-20%)* 4/(4+3+2) x = 0.8*4/9X=80
所以X=80*9/(0.8*4)=225

左=3.2/9x=80
x=1/900