2的倍数：2,4,6,8,10,12,14,16,18,20,22,24,26,28,30,32,34,36,38,40,42,44,46,48,50 3的倍数：3,6,9,12,15,18,21,24,27,30,33,36,39,42,45,48
⑴30,32,34,36,38,40,42,44,46,48,50⑵30,33,36,39,42,45,48,
