3.09x3.9÷3.09x3.9的简便方法?

2025-06-28 01:53:31
推荐回答(2个)
回答1:

简便计算为
3.09*3.9÷3.09*3.9
=3.09÷3.09*(3.9*3.9)
=1*15.21
=15.21

回答2:

3.09×3.9÷3.09×3.9
=(3.09÷3.09)×3.9×3.9
=1×3.9×3.9
=3.9×4-3.9×0.1
=15.6-0.39
=15.21