3.2x-2.4(200-x)=220怎样解这个方程呢?

问题描述:

3.2x-2.4(200-x)=220怎样解这个方程呢?

呜~是125吗,啊~得好好锻炼一下心算了!!

3.2x-2.4*200+2.4x=220
3.2x+2.4x=220+2.4*200
5.6x=700
x=125

3.2x-2.4(200-x)=220
3.2x-480+2.4x=220
5.6x=700
x=125

3.2X-480+2.4X=220
3.2X+2.4X=220+480
5.6X=700
X=700/5.6
X=125