Question

跪求！！！！！！！！a等于多少

表1：第一排：1,2,3,4.......
第二排：2,4,6,8.......
第三排：3,6,9,12......
第四排：4,8,12,16......
第五排：.......
表2：第X排：10.....
第X加1排：......a
第X加2排：......21
表2是表1中截取的一部分，则a等于
请说出理由

Answer 1

10=5*2=10*1
21=7*3=21*1

表中出现数字10的位置有4个：
第一排 第10位
第二排 第 5位
第五排 第 2位
第十排 第 1位

表中出现数字21的位置有4个：
第一排 第21位
第三排 第 7位
第七排 第 3位
第二十一排 第1位

满足表2 的只能是
第5排：5，10，15，……
第6排：6，12，18，……
第7排：7，14，21，……

21对上的a应是18

Answer 2

5啊

Answer 3

5

Answer 4

20

Answer 5

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Answer 6

15.5 (21+10)/2=5.5 5.5+10=15.5