將下列各數(shù)填在相應(yīng)的集合符號里5,-2,-0.3,
1
4
,0,-
1
3
,5.7,-1
1
6
,102,17.
正數(shù)集合:
{5,
1
4
,5.7,102,17…}
{5,
1
4
,5.7,102,17…}
;負(fù)數(shù)集合:
{-2,-0.3,-
1
3
,-1
1
6
…}
{-2,-0.3,-
1
3
,-1
1
6
…}
;
整數(shù)集合:
{5,-2,0,102,17…}
{5,-2,0,102,17…}
;分?jǐn)?shù)集合:
{-0.3,
1
4
,-
1
3
,5.7,-1
1
6
…}
{-0.3,
1
4
,-
1
3
,5.7,-1
1
6
…}
分析:按照有理數(shù)的分類進(jìn)行判斷:有理數(shù)包括:整數(shù)和分?jǐn)?shù);
整數(shù)包括:正整數(shù)、0和負(fù)整數(shù);分?jǐn)?shù)包括:正分?jǐn)?shù)和負(fù)分?jǐn)?shù).
解答:解:正數(shù)集合:{5,
1
4
,5.7,102,17…},
負(fù)數(shù)集合:{-2,-0.3,-
1
3
,-1
1
6
…},
整數(shù)集合;{5,-2,0,102,17…},
分?jǐn)?shù)集合:{-0.3,
1
4
,-
1
3
,5.7,-1
1
6
…}.
故答案分別為:{5,
1
4
,5.7,102,17…},{-2,-0.3,-
1
3
,-1
1
6
…},{5,-2,0,102,17…},{-0.3,
1
4
,-
1
3
,5.7,-1
1
6
…}.
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)、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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