體操隊(duì)里女隊(duì)員的人數(shù)占60%,男隊(duì)員人數(shù)和隊(duì)員總?cè)藬?shù)的比是
40
40
:100;男隊(duì)員和女隊(duì)員人數(shù)的最簡單的整數(shù)比是
2:3
2:3
;如果體操隊(duì)有隊(duì)員50人,女隊(duì)員有
30
30
人.
分析:把體操隊(duì)的總?cè)藬?shù)看作單位”1”,女隊(duì)員的人數(shù)占60%,則男隊(duì)員的人數(shù)占總?cè)藬?shù)的(1-60%)=40%,假設(shè)總?cè)藬?shù)是100人,則男隊(duì)員有40人,女隊(duì)員有60人,進(jìn)而根據(jù)題意,進(jìn)行比即可;
如果體操隊(duì)員有50人,則女隊(duì)員的人數(shù)占總?cè)藬?shù)的60%,根據(jù)一個(gè)數(shù)乘分?jǐn)?shù)的意義,用乘法解答即可.
解答:解:假設(shè)總?cè)藬?shù)是100人,則男隊(duì)員有40人,女隊(duì)員有60人,
則:男隊(duì)員人數(shù)和隊(duì)員總?cè)藬?shù)的比是40:100;男隊(duì)員和女隊(duì)員人數(shù)的最簡單的整數(shù)比是:40:60=2:3;
50×60%=30(人);
故答案為:40,2:3,30.
點(diǎn)評(píng):此題考查了比的意義,可以用賦值法進(jìn)行解答;用到的知識(shí)點(diǎn):一個(gè)數(shù)乘分?jǐn)?shù)的意義.
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