（1+2 ）X6=18
3+7+8=18
4+5+9=18
有1到9九个数,请问是按什么把它们分成1,2,6;3,7,8;4,5,9,三类呢
有1到9九个数,请问是按什么把它们分成1,2,6;3,7,8;4,5,9,三类呢
数学人气：476 ℃时间：2019-09-05 09:40:13
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