(15.7 22.5 4.3)×0.5的简便方法?

2025-04-04 19:50:30
推荐回答(1个)
回答1:

(15.7+22.5+4.3)×0.5
= (15.7+4.3+22.5)×0.5
= (20+22.5)×0.5
= 42.5×0.5

= 42.5÷2
= 21.25