86 47 351简便计算脱式?

2025-02-27 02:36:23
推荐回答(1个)
回答1:

简便计算过程方法如下
解:86+47+351
=90-4+50-3+351
=90+50+351-4-3
=140+351-4-3
=491-(4+3)
=491-7
=484