7.9x1.25的巧算

2025-03-07 07:19:05
推荐回答(3个)
回答1:


回答2:


如图

回答3:

7.9×12.5
=(8-0.1)×12.5
=8×12.5-0.1×12.5
=100-1.28
=99.72