题目内容
计算：|
-
|-|
-
|+|
-
|．
| 1 |
| 2009 |
| 1 |
| 2008 |
| 1 |
| 2010 |
| 1 |
| 2008 |
| 1 |
| 2010 |
| 1 |
| 2009 |
原式=
-
-
+
+
-
=0．
| 1 |
| 2008 |
| 1 |
| 2009 |
| 1 |
| 2008 |
| 1 |
| 2010 |
| 1 |
| 2009 |
| 1 |
| 2010 |
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题目内容
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| 2009 |
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| 1 |
| 2010 |
| 1 |
| 2009 |
| 1 |
| 2008 |
| 1 |
| 2009 |
| 1 |
| 2008 |
| 1 |
| 2010 |
| 1 |
| 2009 |
| 1 |
| 2010 |