数学题的算法要简便(81.4+1/6+1/4+1/5)÷(1/4+1/5+1/6)
问题描述:
数学题的算法要简便
(81.4+1/6+1/4+1/5)÷(1/4+1/5+1/6)
答
按计算器得到133
答
(81.4+1/6+1/4+1/5)÷(1/4+1/5+1/6)
=81.4÷(1/4+1/5+1/6)+1
=81.4÷[(15+12+10)/60]+1
=(74+7.4)*60/37+1
=(2+0.2)*60+1
=120+12+1=133