顾名思义，就将开奖号码的和值加上跨度所得之和除去3，去掉小数，将所得号码杀掉。如上期开出号码为2、44，跨度为2，和值为10，所得和为12，除去3得出号码04，因此下期可以杀掉号码04。
https://www.3d178.cn/k3jq/23294.shtml2014-09-24
https://www.3d178.cn/shdd/shahao/23285.shtml2014-09-24
https://www.3d178.cn/shdd/shahao/23208.shtml2014-09-23
这里快3也同样可以用到加法的方法选择号码，加法就是根据最近开出的组选3中奖号码两两相加得出的两个数，下期就杀掉这两个数。
https://www.3d178.cn/k3jq/23158.shtml2014-09-22
https://www.3d178.cn/shdd/shahao/23138.shtml2014-09-22
https://www.3d178.cn/shdd/shahao/23088.shtml2014-09-21
https://www.3d178.cn/shdd/shahao/23055.shtml2014-09-20
https://www.3d178.cn/shdd/shahao/23009.shtml2014-09-19
https://www.3d178.cn/shdd/shahao/22940.shtml2014-09-18
https://www.3d178.cn/shdd/shahao/22893.shtml2014-09-17
https://www.3d178.cn/shdd/shahao/22801.shtml2014-09-16
