一元一次方程解答,一小时内,1.7(2x-1)-3(4x-1)=4(3x+2)-1;2.(5y+1)+(1-y)=(9y+1)+(1-3y);3.20%+(1-20%)(320-x)=320×40%4.2(x-2)+2=x+15.2(x-2)-3(4x-1)=9(1-x)6.11x+64-2x=100-9x7.15-(8-5x)=7x+(4-3x)8.3(x-7)-2[9-4(2-x)]=229.3/2[2/3(1/4x-1)-2]-x=2

Question

一元一次方程解答,一小时内,
1.7(2x-1)-3(4x-1)=4(3x+2)-1;
2.(5y+1)+ (1-y)= (9y+1)+ (1-3y);
3.20%+(1-20%)(320-x)=320×40%
4.2(x-2)+2=x+1
5.2(x-2)-3(4x-1)=9(1-x)
6.11x+64-2x=100-9x
7.15-(8-5x)=7x+(4-3x)
8.3(x-7)-2[9-4(2-x)]=22
9.3/2[2/3(1/4x-1)-2]-x=2
10.2x-10.3x=15
11.0.52x-(1-0.52)x=80
12.x/2+3x/2=7
13.3x+7=32-2x
14.3x+5(138-x)=540
15.3x-7(x-1)=3-2(x+3)
16.18x+3x-3=18-2(2x-1)
17.3(20-y)=6y-4(y-11)
18.-(x/4-1)=5
19.3[4(5y-1)-8]=6
20.10/3(x/5+3/7)=9x/2
21.5/3（x+0.5)+2=3x-6
22.5x+2(2x/3+2)=2/3(x-6)+2
23.(2x-7)/2-(6x-5)/3=2x+3
24.(3x+2)/5-(x-6)=x/3
25.6x-(x/3+2)=2(x/5+5/2)-3
26.3(x/11-2)-5=2+3x/3
27.10/3(2x-6)=3/5
28.x/2-(x/3-2)=3
29.2/3(x+3)-3=5x/3
30.5/3(2x-5/3)=2x/5-8/9
31.25(x/3-x/2+2/5)-2=3/5(x-2/7)+4/9

Answer 1

9.原式化为(1/4 x-1)-3 -x=2【将3/2乘进去,去大括号】
1/4 x -1-3-x=2
-3/4 x=6
x=-6*4/3
x=-8
10. 2x-10.3x=15
-7.7x=15
x=15/-7.7 =-1.94
11.0.52X-0.48X=80
0.04X=80
4X=8000
X=2000
12. x/2+3x/2=7
2x=7
x=3.5
13. 3x+7=32-2x
5x=25
x=5
14. 3x+5(138-x)=540
-2x=540-5*138
x=-75
15. 3x-7(x-1)=3-2(x+3)
-2x+7=-3
-2x=-10
x=5
16. 18x+3x-3=18-2(2x-1)
21x+4x=23
25x=23
x=23/25
17. 3(20-y)=6y-4(y-11)
60-3y=2y+44
-5y=-16
y=16/5
采纳吧!太多了.另外开