16.65除[(7.2减0.54)乘2.5]简便计算
问题描述：
16.65除[(7.2减0.54)乘2.5]简便计算
谢谢,我急等着用.
答
16.65/[(7.2-0.54)*2.5]
=16.65*40/[(7.2-0.54)*2.5*40]
=(17-0.35)*40/[(7.2-0.54)*100]
=(680-14)/(720-54)
=666/666
=1