30以内的合数答:4,6,8,9,10,12,14,15,16,18,20,21,22,24,25,26,27,28,30
30以内所有的互质数有?合数有?答:30以内的互质数按不同的顺序排列太多了,如有2和3,2和5,2和7...3和5,3和7...合数有4,6,8,9,10,12,14,15,16,18,20,21,22,24,25,26,27,28,30,32,33,34,35,36,38,39,40,42,44,45,46,48,49,50,51,52,54,55,56,57,58,60,62,63,64,66,68,...