题目内容
解方程
x-
|
| 7.2-2x=3.8. |
(1)x-
| 1 |
| 4 |
| 3 |
| 5 |
| 3 |
| 4 |
| 3 |
| 5 |
| 3 |
| 4 |
| 3 |
| 4 |
| 3 |
| 5 |
| 3 |
| 4 |
x=
| 4 |
| 5 |
(2)
| 5 |
| 7 |
| 5 |
| 14 |
| 7 |
| 8 |
2x=
| 7 |
| 8 |
2x÷2=
| 7 |
| 8 |
x=
| 7 |
| 16 |
(3)7.2-2x=3.8,
7.2-2x+2x=3.8+2x,
2x+3.8=7.2,
2x+3.8-3.8=7.2-3.8,
2x=3.4,
2x÷2=3.4÷2,
x=1.7.
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