423+198用简单方法计算?

2024-12-28 10:20:06
推荐回答(2个)
回答1:

你好
简便计算过程如下
423+198
=423+(200-2)
=423+200-2
=(423+200)42
=623-2
=621
望采纳

回答2:

423+198
=423+200-2
=623-2
=621