20%+(1-20%)(320-x)=320*40%
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/13 04:02:25
![20%+(1-20%)(320-x)=320*40%](/uploads/image/z/5470321-49-1.jpg?t=20%25%2B%281-20%25%29%28320-x%29%3D320%2A40%25)
x)32P0RF@J@&H~
AO?3]dǮ{fX~O'H0M
ϗ~p'T-PCȬ|:m/g.y{)P}u`R`clM`_,_T Tؚ$ف ^J
20%+(1-20%)(320-x)=320*40%
20%+(1-20%)(320-x)=320*40%
20%+(1-20%)(320-x)=320*40%
原方程变形为:20%+80%(320-x)=320×40%
移项:20%+320(80%-40%)=80%x
同时除以20%得,
1+320×2=4x
解得
x=641/4