问题 解答题
把下列各数分别填在相应的集合里:
-1
1
3
,500%,
22
7
,0.3,0,-1.7,21,-2,1.01001,+6,π
(1)正数集合{                                                      …}
(2)负数集合{                                                      …}
(3)正整数集合{                                                    …}
(4)整数集合{                                                     …}
(5)分数集合{                                                     …}
(6)非负有理数集合{                                               …}
(7)有理数集合{                                                   …}
(8)无理数集合{                                                   …}.
答案

(1)正数集合{500%,

22
7
,0.3,21,1.01001,+6,π,…};

(2)负数集合{-1

1
3
,-1.7,-2,…};

(3)正整数集合{500%,21,+6,…};

(4)整数集合{500%,0,21,-2,+6,…};

(5)分数集合{-1

1
3
22
7
,0.3,-1.7,1.01001,…};

(6)非负有理数集合{500%,

22
7
,0.3,0,21,1.01001,+6,…};

(7)有理数集合{-1

1
3
,500%,
22
7
,0.3,0.-1.7,21,-2,1.01001,+6,…};

(8)无理数集合{π,…}.

选择题
单项选择题 A1/A2型题