在3,13,15,22,37中,( )是质数,( )是合数,( )是3的倍数答:在3,13,15,22,37中,(3,13,37 )是质数,(15,22 )是合数,(3,15 )是3的倍数
2的倍数,3的倍数,5的倍数(分别写出这几个的倍数)答:2的倍数:2,4,6,8,10,12,14,16,18,20,22,24,26,个位数为0,2,4,6,8 3的倍数:3,6,9,12,15,18,21,24,27,数字相加之和为3,6,9 5的倍数:5,10,15,20,25,30,35,个位数为0,5