3.2÷[0.75÷(0.75×4)] 这道题怎么用简便方法?

问题描述:

3.2÷[0.75÷(0.75×4)] 这道题怎么用简便方法?

13102209938
括号前面是除号,去括号要变符号!
3.2÷[0.75÷(0.75×4)]
=3.2÷[0.75÷0.75÷4]
=3.2÷[1÷4]
=3.2÷1×4
=12.8