(20-2.25)*1.6-15*0.1简便算法
问题描述:
(20-2.25)*1.6-15*0.1简便算法
答
(20-2.25)*1.6-15*0.1
=20*1.6-2.25*1.6-1.5
=32-2.25*4*0.4-1.5
=32-9*0.4-1.5
=32-3.6-1.5
=28.4-1.5
=26.9