①以经济建设为中心 ②坚持四项基本原则 ⑧坚持自力更生 ④坚持改革开放
A:①②③
B:①③④
C:①②④
D:②③④
(Ⅰ)求数列{an}的通项公式;
(Ⅱ)若数列{ 1bnbn+1 }的前n项和为Tn,问使Tn> 10002017 的最小正整数n是多少?
A. Guess!
B. When is your birthday?
C. Yes. My birthday is on Dec. 2nd. It is my eleventh birthday this year. What about you?
D. Is your birthday in December?
E. My birthday is on Sept. 4th.
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