网址:http://m.1010jiajiao.com/timu_id_2779375[举报]
设是等差数列,是前n项和,且,,则下列结论错误K*s^5#u的是
设
[
A
B
C
D
设是等差数列,是前n项和,且,,则下列结论中错误的是
[ ]