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【简答题】
已知等比数列{a n }中，a 2 ，a 3 ，a 4 分别是某等差数列的第5项、第3项、第2项，且 a 1 = 1 2 公比q≠1． （1）求数列{a n }的通项公式； （2）已知数列{b n }满足bn= log 1 2 a n 2 ，S n 是数列{b n }的前n项和，求证：当n≥5时，a n S n ＜1．
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举一反三
【单选题】A 68-year-old man has become increasingly lethargic and weak for the past 7 months. On physical examination, his temperature is 36.9 C, pulse is 70/min, respirations are 15/min, and blood pressure is ...
A.
Elevated serum anti-streptolysin O titer
B.
Elevated plasma renin level
C.
Increased blood urea nitrogen level
D.
Increased serum CK-MB level
E.
Positive ANA with"rim"pattern
F.
Positive viral serology
【判断题】Investigators have reported improved outcomes for this patient population with the use of combined chemotherapy. (Introduction section of a paper)
A.
正确
B.
错误
【简答题】已知偶函数 在 上是增函数，试问 在 上是增函数还是减函数？请证明你的结论。
【简答题】A 21-year-old college student presents to the clinic complaining of a sudden onset of chills and fever , muscle aches , headache , fatigue , sore throat , and painful nonproductive cough 3 days prior ...
【判断题】Alipogene tiparvovec or Glybera, e.g., at a cost of $1.6 million per patient, was reported in 2016 to be the world's most expensive drug.
A.
正确
B.
错误
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