(1)2(2-x)-3=-(x-1)

题目

(1)2(2-x)-3=-(x-1)
(2)12(3-2x)-3=9(3-2x)
(3)(1-x)/6-(x-2)/3=0
(4)x/3=(x+2)/2-1
(5)(2-x)/3=(x-2)/4-1
(6)5x/12=(2x-1)/4-1
(7)(x-3)/0.15-(x+4)/0.2=1.6
(8)(40-x)*20％=40*12.5％

答案

(1)2(2-x)-3=-(x-1)
4-2x-3=-x+1
1-2x=-x+1
2x-x=0
x=0
(2)12(3-2x)-3=9(3-2x)
4(3-2x)=3(3-2x)
12-8x=9-6x
8x-6x=12-9
2x=3
x=1.5
(3)(1-x)/6-(x-2)/3=0
1-x-2(x-2)=0
1-x-2x+4=0
5-3x=0
x=5/3
(4)x/3=(x+2)/2-1
2x=3(x+2)-6
2x=3x
x=0
(5)(2-x)/3=(x-2)/4-1
4(2-x)=3(x-2)-12
8-4x=3x-6-12
8-4x=3x-18
4x+3x=8+18
7x=26
x=26/7
(6)5x/12=(2x-1)/4-1
5x=3(2x-1)-12
5x=6x-15
x=15
(7)(x-3)/0.15-(x+4)/0.2=1.6
4(x-3)-3(x+4)=1,6*0.6
4x-12-3x-12=0.96
x=0.96
(8)(40-x)*20％=40*12.5％
8-0.2x=5
0.2x=3
x=15