7.5*46.7+59.9*2.5的简便计算怎么写
问题描述：
7.5*46.7+59.9*2.5的简便计算怎么写
答
7.5*(50-3.3)+(60-0.1)*2.5
=7.5*50-3.3*7.5+60*2.5-0.1*0.25
=2.5*150+60*2.5-9.9*2.5-0.1*2.5
=210*2.5-10*2.5
=200*2.5
=500