將下列各數(shù)填在相應(yīng)的集合里.
-3.8,-20%,4.3,-|-
20
7
|,42,0,-(-
3
5
),-32
整數(shù)集合:{
42,0,-32
42,0,-32
…};
分?jǐn)?shù)集合:{
-3.8,-20%4.3,-|-
20
7
|,-(-
3
5
-3.8,-20%4.3,-|-
20
7
|,-(-
3
5
 …};
正數(shù)集合:{
4.3,42,-(-
3
5
4.3,42,-(-
3
5
…};
負(fù)數(shù)集合:{
-3.8,-|-
20
7
|,-32
-3.8,-|-
20
7
|,-32
 …}.
在已知的數(shù)據(jù)中,最大的數(shù)是
42
42
,最小的數(shù)是
-32
-32
分析:先根據(jù)絕對(duì)值的性質(zhì)和相反數(shù)的定義化簡,根據(jù)有理數(shù)的乘方進(jìn)行計(jì)算,再根據(jù)整數(shù)、分?jǐn)?shù)、正數(shù)、負(fù)數(shù)的定義填空,根據(jù)有理數(shù)的大小比較確定出最大的數(shù)和最小的數(shù).
解答:解:-|-
20
7
|=-
20
7
,42=16,-(-
3
5
)=
3
5
,-32=-9,
整數(shù)集合:{42,0,-32…};
分?jǐn)?shù)集合:{-3.8,-20% 4.3,-|-
20
7
|,-(-
3
5
)…};
正數(shù)集合:{4.3,42,-(-
3
5
)…};
負(fù)數(shù)集合:{-3.8,-|-
20
7
|,-32…}.
在已知的數(shù)據(jù)中,最大的數(shù)是42,最小的數(shù)是-32
點(diǎn)評(píng):本題考查了有理數(shù),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(diǎn).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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