题目内容
解方程
| 5x-2+1.8=3.6 | 7(x-1.2)=2.1. |
(1)5x-2+1.8=3.6,
5x-0.2=3.6,
5x-0.2+0.2=3.6+0.2,
5x=3.8,
5x÷5=3.8÷5,
x=0.76;
(2)7(x-1.2)=2.1,
7x-7×1.2=2.1,
7x-8.4=2.1,
7x-8.4+8.4=2.1+8.4,
7x=10.5,
7x÷7=10.5÷7,
x=1.5.
5x-0.2=3.6,
5x-0.2+0.2=3.6+0.2,
5x=3.8,
5x÷5=3.8÷5,
x=0.76;
(2)7(x-1.2)=2.1,
7x-7×1.2=2.1,
7x-8.4=2.1,
7x-8.4+8.4=2.1+8.4,
7x=10.5,
7x÷7=10.5÷7,
x=1.5.
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