题目内容
计算
+
+
+…+
．
| 1 |
| 1+2 |
| 1 |
| 1+2+3 |
| 1 |
| 1+2+3+4 |
| 1 |
| 1+2+3+…+2008 |
| 1 |
| 1+2 |
| 1 |
| 1+2+3 |
| 1 |
| 1+2+3+4 |
| 1 |
| 1+2+3+…+2008 |
=2×（
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 3 |
| 1 |
| 2007 |
| 1 |
| 2008 |
| 1 |
| 2008 |
| 1 |
| 2009 |
=2×（
| 1 |
| 2 |
| 1 |
| 2009 |
=
| 2007 |
| 2009 |
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