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  • 1. 把下列各数填入相应的集合内:

    ,4, ,0.15,-7.5,- ,0,2.3.

    ①有理数集合:{                                               …};

    ②无理数集合:{                                               …};

    ③正实数集合:{                                               …};

    ④负实数集合:{                                               …}.

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