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7x÷1/4=4/5

7x=4/5×1/4 7x=1/5 x=1/5×1/7 x=1/35

1÷(1/4÷1/5) =1÷5/4 =1x4/5 =4/5 答 案

你好,很高兴为你解答 4÷4/5-4/5÷1/4 用简便方法 具体过程如下图 ÷1/4=x4 具体过程如下图

3.5×5/4+5/4×2.7+3.8×5/4 =(3.5+2.7+3.8)×5/4 =10×1.25 =12.5

7/8+括号里的1/4-1/5÷(1/4) (1)=7/8+(1/4-1/5)÷(1/4) =7/8+(5/20-4/20)÷(1/4) =7/8+1/20÷(1/4) =7/8+1/20x4 =7/8+1/5 =35/40+8/40 =43/40或 =1又3/40 (2)=7/8+(1/4-1/5÷1/4) =7/8+(1/4-1/5x4) =7/8+(1/4-4/5) =7/8+(5/20-16/20) =7/8-11/20 ...

4/5

主要考的是负数的知识,解题如下: 4/5÷(-1)=-4/5 任何数除以1等于任何数,适用于正数。但除以负一的时候要注意是否两个数都是负数,否则结果为正数。 在乘除法算式中,一正一负结果为负,两个都为负结果就是正。所以4/5÷(-1)=-4/5。

4/5+1/5÷1/5 =4/5+1/5×5 =4/5+1 =4/5+5/5 =9/5

4÷5/4-5/4÷4 =4×4/5-5/4×1/4 =16/5-5/16 =(16×16-5×5)/(5×16) =(16+5)×(16-5)/(5×16) =21×11/80 =231/80

=0.2=20% =0.8=80%

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