1 |
2 |
1 |
3 |
1 |
4 |
1 |
10 |
=1+(
1 |
2 |
1 |
3 |
1 |
6 |
1 |
4 |
1 |
5 |
1 |
7 |
1 |
8 |
1 |
9 |
1 |
10 |
=1+1+
1260+1008+720+630+560+504 |
5040 |
=2+
2341 |
2520 |
≈2.93;
1+
1 |
2 |
1 |
3 |
1 |
4 |
1 |
11 |
=2
2341 |
2520 |
1 |
11 |
≈3.01.
所以至少要选11个数.
故答案为:11.
1 |
2 |
1 |
3 |
1 |
4 |
1 |
99 |
1 |
100 |
1 |
2 |
1 |
3 |
1 |
4 |
1 |
10 |
1 |
2 |
1 |
3 |
1 |
6 |
1 |
4 |
1 |
5 |
1 |
7 |
1 |
8 |
1 |
9 |
1 |
10 |
1260+1008+720+630+560+504 |
5040 |
2341 |
2520 |
1 |
2 |
1 |
3 |
1 |
4 |
1 |
11 |
2341 |
2520 |
1 |
11 |