已知集合A=,B=.    (1)当=2时,求;       (2)求使的实

已知集合AB.

   1)当2时,   

   2)求使的实数的取值范围.

答案

1;(2

【解析】

试题分析:(1)因为当=2.集合.所以.

2)因为集合B中当=1.符合...所以.又由集合A,当.不符合条件.又因为时,集合A为空集,所以不符合条件...所以的取值范围是.

考点:1.分类的思想.2.分式不等式的解法.3.集合的包含关系.

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