题目
找规律写数
2,3,5,7,11,13,( ),( )
21,2,19,5,17,8,( ),( )
2,3,5,7,11,13,( ),( )
21,2,19,5,17,8,( ),( )
提问时间:2021-02-22
答案
2,3,5,7,11,13,(17 ),(19 )规律:20以内的质数.21,2,19,5,17,8,(15 ),(11 ) 规律:单数位置上(一、三、五、七)的数依次比前一个数小2:21-2=19,19-2=17,17-2=15;双数位置上(二、四、六、八)的数依次比...
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