an是等差数列,a1=1,S2013/2013-S2009/2009=4,则S2013=() A.2013 B.4024 C.4026 D.4028
来源:学生作业帮助网 编辑:作业帮 时间:2024/09/09 14:52:31
![an是等差数列,a1=1,S2013/2013-S2009/2009=4,则S2013=() A.2013 B.4024 C.4026 D.4028](/uploads/image/z/8640897-33-7.jpg?t=an%E6%98%AF%E7%AD%89%E5%B7%AE%E6%95%B0%E5%88%97%2Ca1%3D1%2CS2013%2F2013-S2009%2F2009%3D4%2C%E5%88%99S2013%3D%28%29+A.2013+B.4024+C.4026+D.4028)
xM
02X,$n^t]^uY\O&!/{<Q؝oŊJslKb$ɱ-CpHVUN9a6em)G
an是等差数列,a1=1,S2013/2013-S2009/2009=4,则S2013=() A.2013 B.4024 C.4026 D.4028
an是等差数列,a1=1,S2013/2013-S2009/2009=4,则S2013=() A.2013 B.4024 C.4026 D.4028
an是等差数列,a1=1,S2013/2013-S2009/2009=4,则S2013=() A.2013 B.4024 C.4026 D.4028
an= a1+(n-1)d
S2013/2013 - S2009/2009 =4
(a1+1006d) - (a1+1004d) =4
2d=4
d=2
S2013 = (a1+1006d)2013
=(2013)^2 =4052169
没正确答案