1.9-1.9*0.9简便算法 5.4除(3.94+0.86)乘0.

问题描述:

1.9-1.9*0.9简便算法 5.4除(3.94+0.86)乘0.

1.9-1.9*0.9
=1.9*(1-0.9)
=1.9*0.1
=0.19
5.4除(3.94+0.86)乘0.8
=5.4÷(4.8)*0.8
=54÷6
=9