28.9*61.3+111*6.15简便计算
问题描述:
28.9*61.3+111*6.15简便计算
答
=28.9*61.3+11.1*61.3+11.1*0.2
=61.3(28.9+11.1)+2.22
=61.3*40+2.22
=2454.22