82.3-40.5\0.81\2.5怎么简便
问题描述：
82.3-40.5\0.81\2.5怎么简便
答
82.3-40.5*100/81*2/5=20
答
82.3-40.5/0.81/2.5
=82.3-40.5÷（0.81×2.5）
=82.3-40.5÷2.025
=82.3-20
=62.3