4X+2(90-X)=280咋解

问题描述:

4X+2(90-X)=280咋解

4x+180-2x=28
4x-2x=280-180
2x=100
x=50

4x + 2*90 -2x =280
2x+180 =280
2x=100

x=50

原式=4X+180-2X=280
2X=280-180
X=50

4X+2(90-X)=280
2x+90-x=140
2x-x=140-90
x=50

4X+2(90-X)=280
4x+180-2x=280
4x-2x=280-180
2x=100
x=50

2x+180=280
2x=100
x=50