23.24除以2.8-7.5乘以0.8怎么用简便算法?

题目

23.24除以2.8-7.5乘以0.8怎么用简便算法?

答案

23.24除以2.8-7.5乘以0.8
=23.24/2.8-6
=(23.24-6*2.8)/2.8
=(23.24-16.8)/2.8
=6.44/2.8
=2.3