30.2*11-117*0.22 脱式计算,简便计算
问题描述:
30.2*11-117*0.22 脱式计算,简便计算
答
30.2*11-117*0.22
=30.2*11-117*0.2*11
=(30.2-117*0.2)*11
=(30.2-23.4)*11
=6.8*11
=74.8