Question

2.5乘以0.6减去1.8乘以0.5用简便方法怎么做

Answer 1

2.5×0.6-1.8×0.5
=0.5×5×0.6-1.8×0.5
=0.5×3-1.8×0.5
=0.5×(3-1.8)
=0.5×1.2
=0.6

追问

那1。8乘以0.5那步怎么没有呢

追答

不用

追问

能不能吧这道题给我清楚的解释一下啊，我刚上四年级，有点看不懂。谢谢啦

追答

要不这样吧
2.5×0.6-1.8×0.5
=2.5×2×0.3-0.9×2×0.5
=5×0.3-0.9×1
=1.5-0.9
=0.6

Answer 2

2.5x0.6-1.8x0.5
=0.5x3-1.8x0.5
=0.5x(3-1.8)
=0.5x1.2
=0.6

祝学习进步，望采纳~~
不懂的欢迎追问~~

Answer 3

0.5*5*0.6-1.8*0.5=0.5*（3-1.8）=0.6

Answer 4

我认为计算器足以，如果纯学术研究，这样计算还比较合理