解方程1⼀2(x-1)=2-1⼀5(x+2)

2025-06-22 14:49:42
推荐回答(4个)
回答1:

两边乘以10得
5(x-1)=20-2(x+2)
5x-5=20-2x-4
7x=21
x=3

回答2:

建议写法:
(x-1)/2=2-(x+2)/5
5(x-1)=20-2(x+2)
5x-5=16-2x
7x=21
x=3

回答3:

2-1/2(x-1)=1/5(x+2)
2-1/2x+1/2=1/5x+2/5
1/5x+1/2x=2+1/2-2/5
0.7x=2.1
x=3

回答4:

(x-1)/2=2-(x+2)/5
5(x-1)=20-2(x+2)
5x-5=16-2x
7x=21
x=3