问题
填空题
数列{an}满足an=
|
答案
∵an=
(n∈N*),n(n+1) 2
∴
=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*),n(n+1) 2
∴
=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