简便计算梯等式

如题所述

第1个回答  2015-09-19
63.9*0.48
=(64-0.1)*(0.5-0.02)
=64*0.5-64*0.02-0.1*0.5+0.1*0.02
=32-1.28-0.05+0.002
=(32+0.002)-(1.28+.0.05)
=32.002-1.33
=30.672本回答被网友采纳