题目内容
计算|
-
|+|
-
|-|
-
|=______．
| 1 |
| 2009 |
| 1 |
| 2008 |
| 1 |
| 2008 |
| 1 |
| 2007 |
| 1 |
| 2009 |
| 1 |
| 2007 |
|
-
|+|
-
|-|
-
|
=
-
+
-
-
+
=0．
故答案为：0．
| 1 |
| 2009 |
| 1 |
| 2008 |
| 1 |
| 2008 |
| 1 |
| 2007 |
| 1 |
| 2009 |
| 1 |
| 2007 |
=
| 1 |
| 2008 |
| 1 |
| 2009 |
| 1 |
| 2007 |
| 1 |
| 2008 |
| 1 |
| 2007 |
| 1 |
| 2009 |
=0．
故答案为：0．
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