3×n×(n+1) |
2 |
當(dāng)n=36時(shí),共1962項(xiàng),分母為108;
當(dāng)n=37時(shí),共2072項(xiàng),分母為111;
因?yàn)椋?011-1962=49,
所以分子是:49,
而分母就是:3n,
即3×37=111,
所求的分?jǐn)?shù)為:
49 |
111 |
故答案為:
49 |
111 |
1 |
3 |
2 |
3 |
1 |
6 |
2 |
6 |
3 |
6 |
4 |
6 |
5 |
6 |
1 |
9 |
2 |
9 |
3 |
9 |
4 |
9 |
5 |
9 |
6 |
9 |
7 |
9 |
8 |
9 |
1 |
12 |
2 |
12 |
11 |
12 |
1 |
15 |
2 |
15 |
3×n×(n+1) |
2 |
49 |
111 |
49 |
111 |