用一元一次方程的解法【1】2x-1=3【2】3-4x=2-x[3]0.2x+1=-1.8x[4]1/3x=9-2/3x
解：【1】2x-1=3
2x=3+1
2x=4
x=2
【2】3-4x=2-x
-4x+x=2-3
-3x=-1
x=1/老陵唤3
[3]0.2x+1=-1.8x
0.2x+1.8x=-1
2x=-1
x=-0.5
[4]1/汪陆3x=9-2/侍凯3x
1/3x+2/3x=9
1x=9
【圆没1】2x-1=3
2x=4
x=2
【纳脊2】3-4x=2-x
3x=1
x=1/洞腔渗3
[3]0.2x+1=-1.8x
2x=-1
x=-1/2
[4]1/3x=9-2/3x
x=9
【1】2x-1=3
解：2x=4
x=2
【2】3-4x=2-x
解：-3x=-1
x=1/3
[3]0.2x+1=-1.8x
解：租携樱2x=-1
x=-1/弊丛2
[4]1/3x=9-2/隐高3x
解：x=9
1. 2x-1=3
2x=4
x=2
2. 3-4x=2-x
3x=1
x=1/晌逗3
3. 0.2x+1=-1.8x
2x=-1
x=-1/2
4. 1/3x=9-2/宴旁卖启旦3x
x=9