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15 3 5
5 2
3 1 2
24 4 6
6 2 4
4 2 2
上下两表是按同一规律排列的两个方格表,那么上表的空白方格中应填的数是
3
3
分析:根据图表中的排列可知本题的排列规律是:左上角的数等于第一行的第二个数与第三个数的乘积,等于第二行与第三行第一个数的乘积,第一行的第二个数等于第二行和第二行第二个数的和,第一行的第三个数等于第二行和第三行第三个数的和.据此解答.
解答:解:根据以上分析知这个数是:5-2=3.
故答案为:3.
点评:本题的关键是找出规律,再进行解答.
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