將下列各數(shù)填在相應(yīng)的集合里.
-3.8,-10,4.3,-|-
20
7
|,42,0,-
36
6
,
-(-
3
5
),π,-0.2020020002…(每隔一個多一個0),
整數(shù)集合:{                                …};
分?jǐn)?shù)集合:{                                …};
正數(shù)集合:{                                …};
負(fù)數(shù)集合:{                                …}.
分析:可按照有理數(shù)的分類填寫:
有理數(shù)
整數(shù)
分?jǐn)?shù)

有理數(shù)
正有理數(shù)
0
負(fù)有理數(shù)

(本題說的正數(shù)和負(fù)數(shù)都是有理數(shù)范圍內(nèi)的).
解答:解:整數(shù)集合;{-10,42,0,-
36
6
},
分?jǐn)?shù)集合:{-3.8,4.3,-|-
20
7
|,-(-
3
5
)}.
正數(shù)集合:{4.3,42,-(-
3
5
),π},
負(fù)數(shù)集合:{-3.8,-10,-|-
20
7
|,-
36
6
,-0.2020020002…(每隔一個多一個0)},
點評:本題考查有理數(shù)的分類以及對整數(shù),分?jǐn)?shù),正數(shù)以及負(fù)數(shù)概念的理解情況.解題關(guān)鍵是認(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)、非負(fù)數(shù)的定義與特點.注意整數(shù)和正數(shù)的區(qū)別,注意0是整數(shù),但不是正數(shù).
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