19×5⼀7-4×5⼀7-1÷5⼀7用简便方法?

2025-06-22 22:48:11
推荐回答(1个)
回答1:

简便计算过程方法如下
解:19×5/7-4×5/7-1÷5/7
=(19-4)x5/7-7/5
=15x5/7-7/5
=10又5/7-1又2/5
=9又11/35