Question

一元一次方程解答方程

[1+30%x+(200-x)*(1+20%)]*90%=200+27.7
[x*（1+30%）+(200-x)*(1+20%)]*90%=200+27.7

是这个 打错

Answer 1

问题：[x*（1+30%）+(200-x)*(1+20%)]*90%=200+27.7
解答：
[x*1.3+(200-x)*1.2]*0.9=227.7
(1.3x+240-1.2x)=227.7/0.9
0.1x+240=253
x=130

Answer 2

[1.3x+1.2(200-x)]*0.9=227.7
(1.3x+1.2*200-1.2x)*0.9=227.7
1.3x+240-1.2x=227.7/0.9
1.3x+1.2(200-x)=253
0.1x+240=253
0.1x=13
x=130
X等于130 怎么样，详细不

Answer 3

1.3x+(200-x)1.2= 227.7/.9=253.0
253=1.3x+240-1.2x
13=0.1x

x=130

Answer 4

1.3x+1.2(200-x)=227.7/0.9
0.1x+240=253
0.1x=13
x=130

追问

1.2(200-x)到240是怎么来的

Answer 5

[1+30%x+(200-x)*(1+20%)]*90%=200+27.7
(1+0.3x+160-0.2x)*0.9=227.7
0.9+0.27x+144-0.18x=227.7
0.27x-0.18x=227.7-144-0.9
0.09x=82.8
x=82.8/0.09
x=920

追问

不好意思题目写错了 [x*（1+30%）+(200-x)*(1+20%)]*90%=200+27.7

追答

[(1+30%)x+(200-x)*(1+20%)]*90%=200+27.7
(1.3x+240+0.2x)*0.9=227.7
1.17x+144+0.18x=227.7
1.17x+0.18x=227.7-144
1.35x=83.7
x=83.7/1.35
x=62