在1-20中,
質數有2,3,5,7,11,13,17,192,3,5,7,11,13,17,19;
合數有4,6,8,9,10,12,14,15,16,18,204,6,8,9,10,12,14,15,16,18,20;
奇數有1,3,5,7,9,11,13,15,17,191,3,5,7,9,11,13,15,17,19;
偶數有2,4,6,8,10,12,14,16,18,202,4,6,8,10,12,14,16,18,20.
【考點】奇數與偶數的初步認識;合數與質數的初步認識.
【答案】2,3,5,7,11,13,17,19;4,6,8,9,10,12,14,15,16,18,20;1,3,5,7,9,11,13,15,17,19;2,4,6,8,10,12,14,16,18,20
【解答】
【點評】
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發(fā)布:2024/8/28 5:0:8組卷:86難度:0.5
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