题目内容
| 2(x+5)=13.6 | 3.2x-6.4=1.6x. |
(1)2(x+5)=13.6,
2(x+5)÷2=13.6÷2,
x+5=6.8,
x+5-5=6.8-5,
x=1.8;
(2)3.2x-6.4=1.6x,
3.2x-6.4+6.4=1.6x+6.4,
3.2x-1.6x=1.6x+6.4-1.6x,
1.6x=6.4,
1.6x÷1.6=6.4÷1.6,
x=4.
2(x+5)÷2=13.6÷2,
x+5=6.8,
x+5-5=6.8-5,
x=1.8;
(2)3.2x-6.4=1.6x,
3.2x-6.4+6.4=1.6x+6.4,
3.2x-1.6x=1.6x+6.4-1.6x,
1.6x=6.4,
1.6x÷1.6=6.4÷1.6,
x=4.
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