在1-20的自然數(shù)中,奇數(shù)有1,3,5,7,9,11,13,15,17,191,3,5,7,9,11,13,15,17,19,偶數(shù)有2,4,6,8,10,12,14,16,18,202,4,6,8,10,12,14,16,18,20質(zhì)數(shù)有2,3,5,7,11,13,17,192,3,5,7,11,13,17,19,合數(shù)有4,6,8,9,10,12,14,15,16,18,204,6,8,9,10,12,14,15,16,18,20.
【答案】1,3,5,7,9,11,13,15,17,19;2,4,6,8,10,12,14,16,18,20;2,3,5,7,11,13,17,19;4,6,8,9,10,12,14,15,16,18,20
【解答】
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發(fā)布:2025/1/8 3:0:1組卷:167引用:36難度:0.9
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