问题 解答题
把下列各数分别填入相应的集合里.
-4,-|-
4
3
|,0,
22
7
π
2
,2013,-(+5),+1.88,0.010010001…,-2.33….
(1)正数集合:{…};
(2)负数集合:{…};
(3)整数集合:{…};
(4)有理数集合:{…}
(5)无理数集合:{…}.
答案

-|-

4
3
|=-
4
3
,-(+5)=-5,

(1)正数集合:{

22
7
π
2
,2013,+1.88,0.010010001…,…};

(2)负数集合:{-4,-|-

4
3
|,-(+5),-2.33…,…};

(3)整数集合:{-4,0,2013,-(+5),…};

(4)有理数集合:{-4,-|-

4
3
|,0,
22
7
,2013,-(+5),+1.88,-2.33…,…}

(5)无理数集合:{

π
2
,0.010010001…,…}.

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