六道解方程
问题描述：
六道解方程
4×（0.8-x）=1.4
5+2/3x-1/2x=12
10x+9=8x+19
115%x+15%x=1.3
2x-1.6×5=12
7×（23-x）=41+3x
答
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4×（0.8-x）=1.4
0.8-x = 1.4 ÷4 = 0.35
x = 0.8 -0.35 = 0.45
5+2/3x-1/2x=12
(2/3x-1/2x)=12 -5
(4-3)x /6 = 7
x = 6x7 = 42