解一元一次方程!急!

1/2(x-1)=2-1/5(x+2)只要答案

0.5x+2/0.03-x=0.3(0.5x+2)/0.2-131/12要过程

3/4[4/3(1/2y-1/4)-8]=3/2y-6要过程

解：

1.2(x-1)=2-1/5(x+2)

10(x-1)=10-(x+2)

10x-10=10-x-2

11x=18

x=18/11

2.0.5x+2/0.03-x=0.3(0.5x+2)/0.2-131/12

0.5x+200/3-x=3(0.5x+2)/2-131/12

6x+800-12x=18(0.5x+2)-131

800-6x=9x+36-131

6x+9x=800+36-131

15x=705

x=47

3.4[4/3(1/2y-1/4)-8]=3/2y-6

16/3(1/2y-1/4)-32=(3/2)y-6

32(1/2y-1/4)--192=9y-36

16y-8-192=9y-36

16y-9y=8+192-36

7y=164

y=164/7

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