9*75-7*25简便方法计算

2025-03-07 15:50:35
推荐回答(2个)
回答1:


red

回答2:

9-×75-7×25
=9×(3×25)-7×25
=9×3×25-7×25
=27×25-7×25
=( 27-7 )×25
=20×25
=500