题目内容
计算.
+
+
+
+
+
+
.
1 |
2 |
1 |
6 |
1 |
20 |
1 |
30 |
1 |
42 |
1 |
56 |
1 |
72 |
1 |
2 |
1 |
6 |
1 |
20 |
1 |
30 |
1 |
42 |
1 |
56 |
1 |
72 |
=1-
1 |
2 |
1 |
2 |
1 |
3 |
1 |
4 |
1 |
5 |
1 |
5 |
1 |
6 |
1 |
6 |
1 |
7 |
1 |
7 |
1 |
8 |
1 |
8 |
1 |
9 |
=1-
1 |
3 |
1 |
4 |
1 |
9 |
=
2 |
3 |
1 |
9 |
1 |
4 |
=
1 |
3 |
1 |
4 |
=
7 |
12 |
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