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1到20各数中,奇数有哪些?偶数有哪些?质数有哪些?合数有哪些?
3个回答
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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
质数有:2,3,5,7,11,13,17,19
合数有:6,8,9,10,12,14,15,16,18,20
偶数有:2,4,6,8,10,12,14,16,18,20
质数有:2,3,5,7,11,13,17,19
合数有:6,8,9,10,12,14,15,16,18,20
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