(1)已知P=,S=,,求实数的取值范围; (2)已知A=,B=,AB=B,

(1)已知P=,S=,求实数的取值范围;

(2)已知A=,B=,AB=B,求实数的取值范围.

答案

解:(1)由题P=

        ⅰ)若,

        ⅱ)若,因为,所以

     所以

    (2) 因为AB=B,所以,

        ⅰ)若B,则

        ⅱ)若B,则

       综上,

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