30各數中,質數、合數、奇數、偶數、3的倍數、5的倍數、2和3的倍數、3和5的倍數、2、3和5的倍數各有哪些
題目:
30各數中,質數、合數、奇數、偶數、3的倍數、5的倍數、2和3的倍數、3和5的倍數、2、3和5的倍數各有哪些
解答:
1-30中
質數有:2,3,5,7,11,13,17,19,23,29
合數有:4,6,8,9,10,12,14,15,16,18,20,21,22,24,25,26,27,28,30
奇數有:1,3,5,7,9,11,13,15,17,19,21,23,25,27,29
偶數有:2,4,6,8,10,12,14,16,18,20,22,24,26,28,30
3的倍數有:3,6,9,12,15,18,21,24,27,30
5的倍數有5,10,15,20,25,30
2和3的倍數有6,12,18,24,30
3和5的倍數有15,30
2、3、5的倍數有:30
添加新評論