0.390.25026用简便计算

分类: 作业答案 • 2021-12-20 12:03:14

问题描述：

0.39*0.25*026用简便计算

答

0.39*0.25*0.26=39*25*26/1000000
=(40-1)*25*26/1000000
=(40*25*26-25*26)/1000000
=(1000*26-50*13)/1000000
=(26000-650)/1000000
=25350/1000000
=0.02535

0.39*0.25*026用简便计算