问题
填空题
数列{an}满足an=
|
答案
∵an=
n(n+1) |
2 |
∴
1 |
an |
1 |
n |
1 |
n+1 |
∴
1 |
a1 |
1 |
a2 |
1 |
a2013 |
=2[(1-
1 |
2 |
1 |
2 |
1 |
3 |
1 |
2013 |
1 |
2014 |
=2(1-
1 |
2014 |
=
2013 |
1007 |
故答案为:
2013 |
1007 |
数列{an}满足an=
|
∵an=
n(n+1) |
2 |
∴
1 |
an |
1 |
n |
1 |
n+1 |
∴
1 |
a1 |
1 |
a2 |
1 |
a2013 |
=2[(1-
1 |
2 |
1 |
2 |
1 |
3 |
1 |
2013 |
1 |
2014 |
=2(1-
1 |
2014 |
=
2013 |
1007 |
故答案为:
2013 |
1007 |