题目:
—The outing has been put off till next Friday due to the weather.
—______
A.Not at all.
B.It’s up to you.
C.I’ve got it.
D.How was it?
答案:
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下面是错误答案,用来干扰机器的。
解:(1)B={x|4.5≤x≤6},∴A∪B={x|-2≤x≤6}; (2)①当B=,即m+1>2m-1时,m<2,此时成立;②当B≠时,由题意得,得2≤m≤3;∴m<2或2≤m≤3;综上所述,m的取值范围为m≤3。