题目内容
1
-x=
x+
=1
x-
=
．
| 5 |
| 12 |
| 1 |
| 3 |
x+
| 7 |
| 12 |
| 1 |
| 18 |
x-
| 2 |
| 9 |
| 3 |
| 18 |
（1）1
-x=
1
-x+x=
+x
+x-
=1
-
x=1
．
（2）x+
=1
x+
-
=1
-
x=
．
（3）x-
=
x-
+
=
+
x=
．
| 5 |
| 12 |
| 1 |
| 3 |
1
| 5 |
| 12 |
| 1 |
| 3 |
| 1 |
| 3 |
| 1 |
| 3 |
| 5 |
| 12 |
| 1 |
| 3 |
x=1
| 1 |
| 12 |
（2）x+
| 7 |
| 12 |
| 1 |
| 18 |
x+
| 7 |
| 12 |
| 7 |
| 12 |
| 1 |
| 18 |
| 7 |
| 12 |
x=
| 17 |
| 36 |
（3）x-
| 2 |
| 9 |
| 3 |
| 18 |
x-
| 2 |
| 9 |
| 2 |
| 9 |
| 3 |
| 18 |
| 2 |
| 9 |
x=
| 7 |
| 18 |
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