1/3单选题
难度：
1.已知集合A=
，且集合B=
，若
，则实数
的值是（ ）
，且集合B=，若，则实数的值是（ ） | A |  |
| B |  |
| C |  |
| D |  |
正确答案：RA==
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
，B=
，若
，则实数
的取值范围是（ ） 
，B=
，若
，则实数
且