1
1/2(2y-(2-y)/2+2)-1/5(5y+(5y+5)/3)=1 --------有些括号没有区分中小号,自己知道就行
(y-(2-y)/4+1)-(y+(y+1)/3)=1
-(2-y)=(y+1)/3
y=-10
2:
3/2[2/3(x/4+1)+2]=x
x/4+4=x
x=16/3
3:
(0.1x-0.2)/0.02=3+(x+1)/0.5
(0.1x-0.2)/0.02-(x+1)/0.5=3
0.03x-0.12=0.03
x=5