1.9-1.9*0.9简便算法 5.4除(3.94+0.86)乘0.

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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简便算法5.4除(3.94+0.86)乘0.1.9-1.9*0.9简便算法5.4除(3.94+0.86)乘0.1

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简便算法 5.4除(3.94+0.86)乘0.

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

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=0.8*5.4/4.8=5.4/6=0.9