[(x+0.4)/0.2]-[(x-3)/0.5]=-1.6

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[(x+0.4)/0.2]-[(x-3)/0.5]=-1.6

[(x+0.4)/0.2]-[(x-3)/0.5]=-1.6
[(x+0.4)/0.2]-[(x-3)/0.5]=-1.6

[(x+0.4)/0.2]-[(x-3)/0.5]=-1.6
[(x+0.4)/0.2]-[(x-3)/0.5｝
=5x+2-2x+6
=3x+8=-1.6
x=-3.2
不懂再问我我会说的详细点,


[(x+0.4)/0.2]-[(x-3)/0.5]=-1.6
1/0.2=5 1/0.5=2
所以5（x+0.4)-2(x-3)=-1.6
展开得
5x+2-2x+6=-1.6
3x+8=-1.6
3x=-9.6
x=-3.2

[(x+0.4)/0.2]-[(x-3)/0.5]=-1.6
这一步是通分：0.5(x+0.4)-0.2(x-3)=-1.6×0.2×0.5
0.5x+0.2-0.2x+0.6+=-0.16
0.3x=-0.96
x=-3.2
解方程就是要这样恒等式做的，要养成好习惯。

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