(1÷0.01-90.9)÷0.13 的简便运算?

问题描述:

(1÷0.01-90.9)÷0.13 的简便运算?

(1÷0.01-90.9)÷0.13
=(100-90.9)÷0.13
=9.1÷0.13
=70