题目内容
解方程．
3x+
=
x-
x=
x-
=
．
3x+
| 2 |
| 3 |
| 8 |
| 9 |
x-
| 3 |
| 8 |
| 5 |
| 3 |
| 1 |
| 5 |
| 1 |
| 2 |
| 3 |
| 10 |
（1）3x+
=
3x+
-
=
-
3x=
3x×
=
×
x=
（2）x-
x=
x=
x×
=
×
x=2
（3）
x-
=
x-
+
=
+
x=
x×5=
×5
x=4
| 2 |
| 3 |
| 8 |
| 9 |
3x+
| 2 |
| 3 |
| 2 |
| 3 |
| 8 |
| 9 |
| 2 |
| 3 |
3x=
| 2 |
| 9 |
3x×
| 1 |
| 3 |
| 2 |
| 9 |
| 1 |
| 3 |
x=
| 2 |
| 27 |
（2）x-
| 3 |
| 8 |
| 5 |
| 3 |
| 5 |
| 8 |
| 5 |
| 3 |
| 5 |
| 8 |
| 8 |
| 5 |
| 5 |
| 3 |
| 8 |
| 5 |
x=2
| 2 |
| 3 |
（3）
| 1 |
| 5 |
| 1 |
| 2 |
| 3 |
| 10 |
| 1 |
| 5 |
| 1 |
| 2 |
| 1 |
| 2 |
| 3 |
| 10 |
| 1 |
| 2 |
| 1 |
| 5 |
| 4 |
| 5 |
| 1 |
| 5 |
| 4 |
| 5 |
x=4
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