80.5*2.8+143.5怎么简便计算_数学解答

80.5*2.8+143.5怎么简便计算

人气：255 ℃　时间：2020-05-24 03:10:08

解答

80.5*2.8+143.5
=80.5*(3-0.2)+143.5
=80.5*3-80.5*0.2+143.5
=241.5-16.1+143.5
=(241.5+143.5)-16.1
=385-16.1
=368.9