(23/25)÷((3/4)+(2/5)) 怎样简便怎样算

问题描述:

(23/25)÷((3/4)+(2/5)) 怎样简便怎样算

=(23/25)÷(15/20+8/20)
=(23/25)÷(23/20)
=23/25×20/23
=4/5