题目内容
1-20
各数中:(1)质数有:____、____、____、____、____、____、____、____.
(2)合数有:____、____、____、____、____、____、____、____、____、____、____.
(从小到大依次填写)
答案:2,3,5,7,11,13,17,19;4,6,8,9,10,12,14,15,16,18,20
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题目内容
1-20
各数中:(1)质数有:____、____、____、____、____、____、____、____.
(2)合数有:____、____、____、____、____、____、____、____、____、____、____.
(从小到大依次填写)