4÷5⼀4一5⼀4÷4用简便方法怎么做

4÷5/4一5/4÷4用简便方法怎么做4÷5/4一5/4÷4该题目怎么用简便方法
2024-11-16 21:28:30
推荐回答(1个)
回答1:

4÷5/4-5/4÷4
=4×4/5-5/4×1/4
=16/5-5/16
=(16×16-5×5)/(5×16)
=(16+5)×(16-5)/(5×16)
=21×11/80
=231/80