题目内容
解方程.
X+
| 2X-
| 5X-3X=15. |
(1)X+
| 3 |
| 5 |
| 7 |
| 10 |
X+
| 3 |
| 5 |
| 3 |
| 5 |
| 7 |
| 10 |
| 3 |
| 5 |
X=
| 1 |
| 10 |
(2)2X-
| 1 |
| 5 |
| 1 |
| 5 |
2X-
| 1 |
| 5 |
| 1 |
| 5 |
| 1 |
| 5 |
| 1 |
| 5 |
2X=1,
2X÷2=1÷2,
X=
| 1 |
| 2 |
(3)5X-3X=15,
2X=15,
2X÷2=15÷2,
X=7.5.
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题目内容
X+
| 2X-
| 5X-3X=15. |
| 3 |
| 5 |
| 7 |
| 10 |
| 3 |
| 5 |
| 3 |
| 5 |
| 7 |
| 10 |
| 3 |
| 5 |
| 1 |
| 10 |
| 1 |
| 5 |
| 1 |
| 5 |
| 1 |
| 5 |
| 1 |
| 5 |
| 1 |
| 5 |
| 1 |
| 5 |
| 1 |
| 2 |