Question

-0.4x+0.9/0.5=0.2x+0.3/0.3+1d等于几

d是打错的(-0.4x+0.9)/0.5=(0.2x+0.3)/0.3+1

Answer 1

-0.4x+0.9/0.5=0.2x+0.3/0.3+1 即
-0.4x+1.8=0.2x+1+1
1.8-1-1=0.2x+0.4x
-0.2=0.6x
x=-0.2/0.6=-1/3

追问

我把题目弄错了，请大虾再帮我解一下，我会给你设为满意回答

追答

(-0.4x+0.9)/0.5=(0.2x+0.3)/0.3+1
两边同乘以0.15去分母得
0.3*(-0.4x+0.9)=0.5*(0.2x+0.3)+0.15
-0.12x+0.27=0.1x +0.15+0.15 移项得
0.27-0.15-0.15=0.1x+0.12x 合并同类项得
-0.03=0.22x
x=-0.03/0.22=-3/22