．

有理数集合{                                   …}；整数集合{                                   …}，

分数集合{                                   …}，非负整数集合{                                   …}，

正有理数集合{                                   …}，负有理数集合{                                   …}，

非负有理数集合{                                   …}．

．

负数集合：______

整数集合：______

正分数集合：______

负整数集合：______

正整数集合：{             …}

负整数集合：{             …}

正分数集合：{             …}

负分数集合：{             …}