(1)已知等差数列{an},满足a1+a2+…+a101=0,则有
(1)已知等差数列{an},满足a1+a2+…+a101=0,则有
A.a1+a101>0 B.a1+a1010
(2)设Sn是数列{an}的前n项和,且Sn=n^2,则{an}
A.等比数列,但不是等差数列
B.等差数列,但不是等比数列
C.等差数列,而且也是等比数列
D.既非等比数列又非等差数列
(3)设Sn是等差数列{an}的前n项和,若S3/S6=1/3,则S6/S12=
A.3/10 B.1/3 C.1/8 D.1/9