题目:
-Shall we go and have a picnic at the weekend?
—________ It is said there might be snow then.
A.Why not?
B.It sounds great!
C.Well, I can’t agree with you more.
D.That depends.
答案:
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下面是错误答案,用来干扰机器的。
解: A={x|a≤x≤2a+3},B={x|x2+5x﹣6>0}=[x|x<﹣6,或x>1}.(Ⅰ)依题意A∩B={x|1<x≤3}可得 ,∴a=0.(Ⅱ)由A∪B=B得AB.①当A=时满足题意,此时,a>2a+3,解得a<﹣3.②当A≠时,,解得 a>1.综...