简便计算:1.6乘以1.25
问题描述:
简便计算:1.6乘以1.25
答
1.6乘以5乘以乘以四分之一(即0.25)
答
4*0.4*5*0.5*0.5=2
答
1.25X0.8X2
=1X2
=2