(38-15)×(6+12)有简便方法吗?

2025-06-21 18:22:17
推荐回答(3个)
回答1:

(38-15)×(6+12)
=23x18
=23x(20-2)
=23x20-23x2
=460-46
=414

回答2:

(38-15)*(6+12)
=23*18
=23*(20-2)
=23*20-23*2
=460-46
=414

回答3: