倍数与因数1 9 11 15 17 19 21 27 33 35 37 41 45 49 57 65 72 81 质数有;合数有;偶数有;奇数有;写出5个质数和5个合数30中质数有;合数有;奇数有;偶数有;3的倍数有5的倍数有;同时是2和3的倍数有,同时是3和5
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倍数与因数1 9 11 15 17 19 21 27 33 35 37 41 45 49 57 65 72 81 质数有;合数有;偶数有;奇数有;写出5个质数和5个合数30中质数有;合数有;奇数有;偶数有;3的倍数有5的倍数有;同时是2和3的倍数有,同时是3和5
倍数与因数
1 9 11 15 17 19 21 27 33 35 37 41 45 49 57 65 72 81
质数有;
合数有;
偶数有;
奇数有;
写出5个质数和5个合数
30中质数有;合数有;奇数有;偶数有;3的倍数有
5的倍数有;同时是2和3的倍数有,同时是3和5的倍数有,同时是2 3 5的倍数有.
倍数与因数1 9 11 15 17 19 21 27 33 35 37 41 45 49 57 65 72 81 质数有;合数有;偶数有;奇数有;写出5个质数和5个合数30中质数有;合数有;奇数有;偶数有;3的倍数有5的倍数有;同时是2和3的倍数有,同时是3和5
质数有; 11,17,19,37,41
合数有; 9,15,21,27,33,35,45,49,57,65,72,81
偶数有; 72
奇数有; 1,9,11,15,17,19,21,27,33,35,37,41,45,49,57,65,81
写出5个质数和5个合数
5个质数:2,3,5,7,11
5个合数:4,6,8,9,10,
1~30中质数有;2,3, 5 ,7 ,11 ,13 ,17 ,19 ,23 ,29.
1~30中合数有;4 ,6 ,8 ,9 ,10, 12, 14, 15 ,16 ,18 ,20, 21, 22 ,24 ,25 ,26, 27, 28 ,30 .
1~30中奇数有;1,3,5,7,9,11,13,15,17,19,21,23,25,27,29.
1~30中偶数有;2,4,6,8,10,12,14,16,18,20,22,24,26,28,30.
3的倍数有 3,6,9,12,15,18,21,24,27,30.
5的倍数有;5,10,15,20,25,30.
同时是2和3的倍数有6,12,18,24,30.
同时是3和5的倍数有15,30,
同时是2 3 5的倍数有30.
1 9 11 15 17 19 21 27 33 35 37 41 45 49 57 65 72 81
质数有; 11,17,19,37,41
合数有; 9,15,21,27,33,35,45,49,57,65,72,81
偶数有; 72
奇数有; 1,9,11,15,17,19,21,27,33,35,37,41,45,49,57,65,81
写出5个质...
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1 9 11 15 17 19 21 27 33 35 37 41 45 49 57 65 72 81
质数有; 11,17,19,37,41
合数有; 9,15,21,27,33,35,45,49,57,65,72,81
偶数有; 72
奇数有; 1,9,11,15,17,19,21,27,33,35,37,41,45,49,57,65,81
写出5个质数和5个合数:
质数:2,3,5,7,11
和数:4,6,8,9,10
1~30中质数有;2,3,5,7,11,13,17,19,23,29
合数有;4,6,8,9,10,12,14,15,16,18,20,21,22,24,25,26,27,28,30
奇数有;1,3,5,7,9,11,13,15,17,19,21,23,25,27,29
偶数有;2,4,6,8,10,12,14,16,18,20,22,24,26,28,30
3的倍数有:3,6,9,12,15,18,21,24,27,30
5的倍数有;5,10,15,20,25,30
同时是2和3的倍数有:6,18,24,30
同时是3和5的倍数有:15,30
同时是2 3 5的倍数有.30
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