Question

1、有理數(shù)-25.75屬于（　�。�

A、正整數(shù)集合

B、負(fù)整數(shù)集合

C、正分?jǐn)?shù)集合

D、負(fù)分?jǐn)?shù)集合

Answer 1

分析：有理數(shù)$left{egin{array}{l}整數(shù)left{egin{array}{l}正整數(shù)\0\負(fù)整數(shù)end{array} ight.\分?jǐn)?shù)left{egin{array}{l}正分?jǐn)?shù)\負(fù)分?jǐn)?shù)end{array} ight.end{array} ight.$．

解答：解：根據(jù)有理數(shù)的分類，可知有理數(shù)-25.75屬于負(fù)分?jǐn)?shù)集合．故選D．

點(diǎn)評：認(rèn)真掌握正數(shù)、負(fù)數(shù)、整數(shù)、分?jǐn)?shù)、正有理數(shù)、負(fù)有理數(shù)的定義與特點(diǎn)．