从1---20中,奇数有多少,偶数有多少,质数有多少,合数有多少?解答答:奇数:1,3,5,7,9,11,13,15,17,19 偶数:2,4,6,8,1,12,14,16,18,20 质数:2,3,5,7,11,13,17,19 合数:4,6,8,9,10,12,14,15,16,18,20 奇数有10个,偶数有10个,质数有8个,合数有11个
1到20各数中,奇数有哪些?偶数有哪些?质数有哪些?合数有哪些?答:奇数有:1,3,5,7,9,11,13,15,17,19 偶数有:2,4,6,8,10,12,14,16,18,20 质数有:2,3,5,7,11,13,17,19 合数有:6,8,9,10,12,14,15,16,18,20