问题
填空题
数列
|
答案
据题意,数列的通项为
an=
=1+(n+1)2+1 (n+1)2-1
=1+2 n(n+2)
-1 n 1 n+2
所以数列的前10项和为10+(1-
+1 3
-1 2
+1 4
-1 3
+…+1 5
-1 10
)1 12
=10+(1+
-1 2
-1 11
)1 12
=10+175 132
=1143 132
故答案为1143 132
数列
|
据题意,数列的通项为
an=
=1+(n+1)2+1 (n+1)2-1
=1+2 n(n+2)
-1 n 1 n+2
所以数列的前10项和为10+(1-
+1 3
-1 2
+1 4
-1 3
+…+1 5
-1 10
)1 12
=10+(1+
-1 2
-1 11
)1 12
=10+175 132
=1143 132
故答案为1143 132