题目内容
解下列方程．
x-
=
-x=
+x=
．
x-
| 1 |
| 5 |
| 7 |
| 20 |
| 7 |
| 8 |
| 1 |
| 6 |
| 1 |
| 4 |
| 9 |
| 10 |
（1）x-
| 1 |
| 5 |
| 7 |
| 20 |
x-
| 1 |
| 5 |
| 1 |
| 5 |
| 7 |
| 20 |
| 1 |
| 5 |
x=
| 11 |
| 20 |
（2）
| 7 |
| 8 |
| 1 |
| 6 |
| 7 |
| 8 |
| 1 |
| 6 |
x+
| 1 |
| 6 |
| 7 |
| 8 |
x+
| 1 |
| 6 |
| 1 |
| 6 |
| 7 |
| 8 |
| 1 |
| 6 |
x=
| 17 |
| 24 |
（3）
| 1 |
| 4 |
| 9 |
| 10 |
| 1 |
| 4 |
| 1 |
| 4 |
| 9 |
| 10 |
| 1 |
| 4 |
x=
| 13 |
| 20 |
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