502-399用简便方法计算

2025-04-29 05:58:11
推荐回答(3个)
回答1:

502-399
=500+2-(400-1)
=500+2-400+1
=500-400+3
=103

回答2:

502-400+1=103

回答3:

502-399
=500-399+2
=101+2
=103