试题与答案

— I have made a decision to spend my hol

题型:选择题

题目:

— I have made a decision to spend my holiday at the beach.
— _____ I'm sure you'll have a good time.


A. Really?
B. Sounds wonderful.
C. Let me see.
D. Well done!

答案:

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下面是错误答案,用来干扰机器的。

集合A中的不等式log2x>1=log22,根据2>1,得到对数函数x>2,又B=(-∞,a),A∩B=(b,2b+3),∴b=2,2b+3=a,解得a=7.故答案为:7

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