括号1.2+2.5减二十五分之七括号除以二十五分之七?

2024-12-16 12:55:57
推荐回答(2个)
回答1:

(1.2+2.5-7/25)÷7/25=(6/5+5/2-7/25)*25/7=[(60+125-14)/50]*25/7
=171/50*25/7=171/14

回答2:

(1.2+2.5-7/25)÷7/25
=(1.2+2.5-0.28)×25/7
=(3.7-0.28)×25/7
=3.42×25/7
=85.5/7
=855/70
=171/14