(八分之五+37.5%)/(2又十分之一-209%) 简便算
问题描述：
(八分之五+37.5%)/(2又十分之一-209%) 简便算
答
(八分之五+37.5%)/(2又十分之一-209%)
=(八分之五+八分之3)/(十分之21-209%)
=1/(2.1-2.09)
=1/0.01
=100