0.39*0.25*026用简便计算_数学解答

0.39*0.25*026用简便计算

人气：445 ℃　时间：2020-03-27 03:08:31

解答

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