题目内容
计算：|
-
|+|
-
|+|
-
|+…+|
-
|
| 1 |
| 4 |
| 1 |
| 3 |
| 1 |
| 5 |
| 1 |
| 4 |
| 1 |
| 6 |
| 1 |
| 5 |
| 1 |
| 20 |
| 1 |
| 19 |
原式=（
-
）+（
-
）+（
-
）+…+（
-
）
=
-
+
-
+
-
+…+
-
=
-
=
．
| 1 |
| 3 |
| 1 |
| 4 |
| 1 |
| 4 |
| 1 |
| 5 |
| 1 |
| 5 |
| 1 |
| 6 |
| 1 |
| 19 |
| 1 |
| 20 |
=
| 1 |
| 3 |
| 1 |
| 4 |
| 1 |
| 4 |
| 1 |
| 5 |
| 1 |
| 5 |
| 1 |
| 6 |
| 1 |
| 19 |
| 1 |
| 20 |
=
| 1 |
| 3 |
| 1 |
| 20 |
=
| 17 |
| 60 |
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