解方程5x-0.4/0.3 +1.3-3x/2 =1.8-8x/25x-0.4/0.3 +1.3-3x/2 =1.8-8x/2

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解方程5x-0.4/0.3 +1.3-3x/2 =1.8-8x/25x-0.4/0.3 +1.3-3x/2 =1.8-8x/2
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解方程5x-0.4/0.3 +1.3-3x/2 =1.8-8x/25x-0.4/0.3 +1.3-3x/2 =1.8-8x/2
解方程5x-0.4/0.3 +1.3-3x/2 =1.8-8x/2
5x-0.4/0.3 +1.3-3x/2 =1.8-8x/2

解方程5x-0.4/0.3 +1.3-3x/2 =1.8-8x/25x-0.4/0.3 +1.3-3x/2 =1.8-8x/2
5x-0.4/0.3 +1.3-3x/2 =1.8-8x/2
5x-4/3+13/10-3x/2=9/5-4x(移项)
5x+4x-3x/2=9/5+4/3-13/10
15x/2=11/6
15x=11/6*2
15x=11/3
x=11/3*1/15
x=11/45

左右换一下就行了!x=11/45