2.8乘2.5乘1.25乘4用简便算
问题描述:
2.8乘2.5乘1.25乘4用简便算
答
2.8乘2.5乘1.25乘4
=0.7x(4x2.5)x(1.25x4)
=0.7x10x5
=35