题目

— I missed the beginning of The Voice of China last week.    —         ! But you can watch re-play this week.   A. Be careful                               B. Try your best      C. What a pity                              D. What good news 答案：C（本小题满分12分）已知数列{}满足,且点在函数的图象上，其中=1,2,3,….（Ⅰ）证明：数列{lg(1+)}是等比数列；（Ⅱ）设=(1+)（1+）…（1+），求及数列{}的通项.