在1~20中,即是合数又是奇数的数有哪些答:质数有:(2,3,5,7,11,13,17,19)合数有:(4,6,8,9,10,12,14,15,16,18,20)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)既是偶数,又是素数的有:(2)既是奇数,又是合数的有:(9,15)既不是质数,又不是合数的有:(1)你好!
...哪些是质数?哪些是合数?哪些是奇数?哪些是偶数?答:质数:17,29,67,83,19 合数:33,14,,58,98,70,51,35,91,38,15,49.奇数:33,17,29,67,83,51,35,91,19,15,49.偶数:14,58,98,70,38,既是奇数又是合数:33,51,35,91,15,49.既是偶数又是合数:14,58,98,70,38