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從如圖四張數(shù)字卡片中取出三張,按要求組成三位數(shù).
(1)可以組成的三位數(shù)有:
450,405,470,407,540,504,507,570,457,475,574,547,745,754,740,704,750,705
450,405,470,407,540,504,507,570,457,475,574,547,745,754,740,704,750,705
;
(2)這些數(shù)中:奇數(shù)有
405,407,507,457,475,547,745,705
405,407,507,457,475,547,745,705
;偶數(shù)有
450,470,540,504,570,574,754,740,704,750
450,470,540,504,570,574,754,740,704,750
;
(3)3的倍數(shù)有
450,405,507,570,540,504,750,705
450,405,507,570,540,504,750,705
;5的倍數(shù)有
450,405,470,540,570,475,745,740,750,705
450,405,470,540,570,475,745,740,750,705

(4)既是3的倍數(shù),又是2的倍數(shù)有
450,540,504,570,750
450,540,504,570,750

(5)既是3的倍數(shù),又是5的倍數(shù)有
450,405,540,570,750,705
450,405,540,570,750,705
;
(6)同時是2、5和3的倍數(shù)的數(shù)有
450,540,570,750
450,540,570,750

【答案】450,405,470,407,540,504,507,570,457,475,574,547,745,754,740,704,750,705;405,407,507,457,475,547,745,705;450,470,540,504,570,574,754,740,704,750;450,405,507,570,540,504,750,705;450,405,470,540,570,475,745,740,750,705;450,540,504,570,750;450,405,540,570,750,705;450,540,570,750
【解答】
【點評】
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發(fā)布:2025/1/7 23:0:1組卷:78引用:2難度:0.5
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