题目内容
[1-（
+
）]÷
．
| 1 |
| 2 |
| 1 |
| 6 |
| 1 |
| 3 |
[1-（
+
）]÷
，
=[1-
]÷
，
=
÷
，
=1．
| 1 |
| 2 |
| 1 |
| 6 |
| 1 |
| 3 |
=[1-
| 2 |
| 3 |
| 1 |
| 3 |
=
| 1 |
| 3 |
| 1 |
| 3 |
=1．
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