题目内容
计算：
+
+
+
+
=______．
| 1 |
| 1×5 |
| 1 |
| 5×10 |
| 1 |
| 10×15 |
| 1 |
| 15×20 |
| 1 |
| 20×25 |
| 1 |
| 1×5 |
| 1 |
| 5×10 |
| 1 |
| 10×15 |
| 1 |
| 15×20 |
| 1 |
| 20×25 |
=
| 1 |
| 5 |
| 1 |
| 5 |
| 1 |
| 5 |
| 1 |
| 10 |
| 1 |
| 10 |
| 1 |
| 15 |
| 1 |
| 15 |
| 1 |
| 20 |
| 1 |
| 20 |
| 1 |
| 25 |
=
| 1 |
| 5 |
| 1 |
| 5 |
| 1 |
| 5 |
| 1 |
| 25 |
=
| 1 |
| 5 |
| 1 |
| 5 |
| 4 |
| 25 |
=
| 29 |
| 125 |
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