1/5x-1/2(3-2x)=1 1/7(2x+14)=4-2x 3/10(200+x)-2/10(300-x)=300x 9/251/5x-1/2(3-2x)=11/7(2x+14)=4-2x 3/10(200+x)-2/10(300-x)=300x 9/25

1/5x-1/2(3-2x)=1 1/7(2x+14)=4-2x 3/10(200+x)-2/10(300-x)=300x 9/251/5x-1/2(3-2x)=11/7(2x+14)=4-2x 3/10(200+x)-2/10(300-x)=300x 9/25
1/5x-1/2(3-2x)=1 1/7(2x+14)=4-2x 3/10(200+x)-2/10(300-x)=300x 9/25
1/5x-1/2(3-2x)=1
1/7(2x+14)=4-2x
3/10(200+x)-2/10(300-x)=300x 9/25

1/5x-1/2(3-2x)=1 1/7(2x+14)=4-2x 3/10(200+x)-2/10(300-x)=300x 9/251/5x-1/2(3-2x)=11/7(2x+14)=4-2x 3/10(200+x)-2/10(300-x)=300x 9/25
1/5x-1/2(3-2x)=1
两边乘10
2x-15+10x=1
12x=16
x=4/3
1/7(2x+14)=4-2x
两边乘7
2x+14=28-14x
2x+14x=28-14
16x=14
x=14÷16
x=7/8
3/10(200+x)-2/10(300-x)=300x+9/25
两边乘50
3000+15x-3000+10x=15000x+18
14975x=-18
x=-18/14975