將下列各數(shù)填在相應(yīng)的集合里.-3.8,-10,4.3,-|-
20
7
|
,42,0,-(-
3
5
)
,π,3.3030030003….
有理數(shù)集合
{-3.8,-10,4.3,-|-
20
7
|,42,0,-(-
3
5
),…}
{-3.8,-10,4.3,-|-
20
7
|,42,0,-(-
3
5
),…}
;
正數(shù)集合
{4.3,42,-(-
3
5
),π,3.3030030003…}
{4.3,42,-(-
3
5
),π,3.3030030003…}
;
負(fù)數(shù)集合
{-3.8,-10,-|-
20
7
|,…}
{-3.8,-10,-|-
20
7
|,…}

無(wú)理數(shù)集合
{π,3.3030030003…}
{π,3.3030030003…}
分析:先對(duì)于第四、五、七個(gè)式子化簡(jiǎn),利用各自的定義判斷,即可得到正確結(jié)果.
解答:解:根據(jù)題意得:-|-
20
7
|=-
20
7
,42=16,-(-
3
5
)=
3
5
,
則有理數(shù)集合:{-3.8,-10,4.3,-|-
20
7
|,42,0,-(-
3
5
),…};
正數(shù)集合:{4.3,42,-(-
3
5
),π,3.3030030003…};
負(fù)數(shù)集合:{-3.8,-10,-|-
20
7
|,…};
無(wú)理數(shù)集合:{ π,3.3030030003…}.
故答案為:{-3.8,-10,4.3,-|-
20
7
|,42,0,-(-
3
5
),…};{4.3,42,-(-
3
5
),π,3.3030030003…};{-3.8,-10,-|-
20
7
|,…};{ π,3.3030030003…}
點(diǎn)評(píng):此題考查了實(shí)數(shù),熟練掌握各自的定義是解本題的關(guān)鍵.
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