简便计算:39*0.12-1.3*3.6
问题描述:
简便计算:39*0.12-1.3*3.6
答
39*0.12-1.3*3.6
=30*1.3*0.12-1.3*3.6
=1.3*(30*0.12)-1.3*3.6
=1.3*3.6-1.3*3.6
=0