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  • 1. (2020七上·巴南月考) 把下列各数填在相应的大括号内:-5, ,-12,0, ,-3.14,+1.99,+6, .

    ( 1 )正数集合:{                                               …};

    ( 2 )负数集合:{                                               …};

    ( 3 )分数集合:{                                                …};

    ( 4 )非负整数集合:{                                             …}.

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