13.2+12.4-3.2+7.6用简便算法怎么算?

2025-06-20 14:53:13
推荐回答(2个)
回答1:

13.2+12.4-3.2+7.6
=13.2-3.2+(12.4+7.6)
=10+20
=30

回答2:

13.2+12.4-3.2+7.6
=(13.2-3.2)+(12.4+7.6)
=10+20
=30