问题
选择题
已知
|
答案
令an=
=(8n-4)(8n+2)-(8n-2)(8n)=-88n-4 8n-2 8n 8n+2
∵
=a2512004 2006 2008 2010
∴数列共有251项,
+4 6 8 10
+…+12 14 16 18
=-8×251=-20082004 2006 2008 2010
故选A.
已知
|
令an=
=(8n-4)(8n+2)-(8n-2)(8n)=-88n-4 8n-2 8n 8n+2
∵
=a2512004 2006 2008 2010
∴数列共有251项,
+4 6 8 10
+…+12 14 16 18
=-8×251=-20082004 2006 2008 2010
故选A.