递等式计算,嫩简便就简便:12.5*(40+0.8)*2.5

问题描述:

递等式计算,嫩简便就简便:12.5*(40+0.8)*2.5

12.5*(40+0.8)*2.5
=12.5*40*2.5+12.5*0.8*2.5
=12.5*100+12.5*2
=1250+25
=1275