watch and think and find the number for the question mark

来源：学生作业帮编辑：神马作文网作业帮分类：数学作业时间：2024/11/11 09:45:14

watch and think and find the number for the question mark
8 13 12 6 22 3 43 5
12 13 14
5 3 4 2 9 5 11 6

可能是36,不知道对不对.
第一列：8+13-5-3=13,所以12=13-1
第二列：12+6-4-2=12,所以13=12+1
第三列：22+3-9-5=11,所以14=11+3
可以看出所求的数=上两个数的和-下两个数的和+一个有规律的数,
这个有规律的数是一个等差数列,公差为2.
所以所求的数=43+5-11-6+5=36
再问：这是个选择题，正确答案是19，但是我不知道为什么

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