题型:问答题 简答题 A.条件(1)充分,但条件(2)不充分.B.条件(2)充分,但条件(1)不充分.C.条件(1)和(2)单独都不充分,但条件(1)和条件(2)联合起来充分.D.条件(1)充分,条件(2)也充分.E.条件(1)和条件(2)单独都不充分,条件(1)和条件(2)联合起来也不充分.){an}的前n项和Sn与{bn}的前n项和Tn满足S19:T19=3:2. (1){an)和{bn}是等差数列. (2)a10:b10=3:2. 查看答案