1+0.5x=0.5x7
1+0.5x=3.5
0.5x=2.5
x=5
0.75x+0.5x=2.25
1.25x=2.25
等号两边÷1.25
x=1.8
3x+4.5x8=72
3x+36=72
3x=36
x=12
(10-7.5)x=0.125X8
2.5x=1
等号两边÷2.5
x=0.4
1+0.5x=0.5x7
1+0.5x=3.5
0.5x=2.5
x=5
0.75x+0.5x=2.25
1.25x=2.25
等号两边÷1.25
x=1.8
3x+4.5x8=72
3x+36=72
3x=36
x=12
(10-7.5)x=0.125X8
2.5x=1
等号两边÷2.5
x=0.4