5分之4+8*0.45 怎么简便计算
问题描述:
5分之4+8*0.45 怎么简便计算
答
5分之4+8*0.45
=0.8+8*0.45
=0.8+0.8*4.5
=0.8(1+4.5)
=0.8*5.5
=4.4