【简答题】已知数列{ a n }是公比为q的等比数列,S n 是其前n项和,且S 3 ,S 9 ,S 6 成等差数列 (1)求证: a 2 , a 8 , a 5 也成等差数列 (2)判断以 a 2 , a 8 , a 5 为前三项的等差数列的第四项是否也是数列{ a n }中的一项,若是求出这一项,若不是请说明理由
【判断题】The theory of learning underlying the Grammar-Translation Method was Faculty Psychology. The Faculty Psychologists believed that the mind of human beings had various faculties which could be trained s...