3分之1这里写作1/3的
(x+1/3)×30%=62.5%
x+1/3=5/8÷3/10
x=25/12-1/3
x=21/12
x=7/4
2x:1/3=0.6
2x=0.6x1/3
2x=0.2
x=0.1
3/4x-50%=7
0.75x=7+0.5
0.75x=7.5
x=10
3分之1这里写作1/3的
(x+1/3)×30%=62.5%
x+1/3=5/8÷3/10
x=25/12-1/3
x=21/12
x=7/4
2x:1/3=0.6
2x=0.6x1/3
2x=0.2
x=0.1
3/4x-50%=7
0.75x=7+0.5
0.75x=7.5
x=10