题目内容
运用裂项法计算:
+
+
+
+
.
1 |
3 |
1 |
15 |
1 |
35 |
1 |
63 |
1 |
99 |
1 |
3 |
1 |
15 |
1 |
35 |
1 |
63 |
1 |
99 |
1 |
2 |
1 |
3 |
1 |
2 |
1 |
3 |
1 |
5 |
1 |
2 |
1 |
5 |
1 |
7 |
1 |
2 |
1 |
7 |
1 |
9 |
1 |
2 |
1 |
9 |
1 |
11 |
=
1 |
2 |
1 |
3 |
1 |
3 |
1 |
5 |
1 |
5 |
1 |
7 |
1 |
7 |
1 |
9 |
1 |
9 |
1 |
11 |
=
1 |
2 |
1 |
11 |
=
1 |
2 |
10 |
11 |
=
5 |
11 |
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