问题 解答题
解方程
(x+1.7)×2=9.2

8x-4x=0.64

2x-0.24=0.12

7x+2.5X=3.8.
答案

①(x+1.7)×2=9.2,

(x+1.7)×2÷2=9.2÷2,

x+1.7=4.6,

x+1.7-1.7=4.6-1.7,

x=2.9;

②8x-4x=0.64,

x(8-4)=0.64,

4x=0.64,

4x÷4=0.64÷4,

x=0.16;

③2x-0.24=0.12,

2x-0.24+0.24=0.12+0.24,

2x=0.36,

2x÷2=0.36÷2,

x=0.18;

④7x+2.5X=3.8.

x(7+2.5)=3.8,

9.5x=3.8,

9.5x÷9.5=3.8÷9.5,

x=0.4.

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