简便方法计算:7.5×2.7+1.9×2.5
问题描述:
简便方法计算:7.5×2.7+1.9×2.5
答
7.5*2.7+1.9*2.5
=2.5*3*2.7+1.9*2.5
=(8.1+1.9)*2.5
=25