0.4(30+x)=x-18 怎么解?

0.4(30+x)=x-18
12+0.4x=x-18
0.4x-x=-18-12
-0.6x=-30
x=-30/-0.6
x=50

0.4(30+x)=x-18
12+0.4x=x-18
x-0.4x=12+18
0.6x=30
x=30/0.6=50

zhe...

12+0.4x=x-18 30=0.6x x=50

0.4*30+0.4x=x-18
12+18=0.4x-x

0.4(30+x)=x-18
12+0.4x=x-18 移项即可得出

o.4(30+X)=x-18
12+0.4x=x-18
0.4x-x=-18-12
-0.6x=-30
x=50

0.4(30+x)=x-18
解:12+0.4X=X-18
→12+18=X-0.4X
→30=0.6解得X=50

12+0.4X=X+18 12+18=X-0.4X 0.6X=30 x=50

0.4(30+x)=x-18
0.4*30+0.4*x=x-18
12+0.4x=x-18
12+18=x-0.4x
30=0.6x
x=50

0.4X30+0.4X=X-18
12+0.4X=X-18
12+0.4X+18=X
12+18=x-0.4X
30=X-0.4X
30=0.6X
X=50
把结果验证一下:
0.4(30+50)=50-18
12+20=50-18
32=32