tính hợp lí d=3\5 - 1\4 + 2\5 - 1\3 e.15\9 + 4\3 - 5\4 - 3\4 giúp êm em vote 5 sao lun

`D = 3/5 - 1/4 + 2/5 - 1/3`

`=> D = (3/5 + 2/5 ) - ( 1/4 + 1/3 )`

`=> D = 1 - 7/12`

`=> D = 5/12`

Vậy `D = 5/12`

`E = 15/9 + 4/3 - 5/4 - 3/4`

`=> E = (15/9 + 4/3 ) - (5/4 + 3/4 )`

`=> E = 3 - 2`

`=> E = 1`

Vậy `E = 1

`#dtkc`

$\text{#Zane#}$

D = $\dfrac{3}{5}$ - $\dfrac{1}{4}$ + $\dfrac{2}{5}$ - $\dfrac{1}{3}$

D = $\dfrac{3}{5}$ + $\dfrac{2}{5}$ - $\dfrac{1}{4}$ - $\dfrac{1}{3}$

D = $\text{1}$ - $\dfrac{1}{4}$ - $\dfrac{1}{3}$

D = $\dfrac{3}{4}$ - $\dfrac{1}{3}$

D = $\dfrac{5}{12}$

E = $\dfrac{15}{9}$ - $\dfrac{4}{3}$ + $\dfrac{5}{4}$ - $\dfrac{3}{4}$

E = ($\dfrac{15}{9}$ + $\dfrac{4}{3}$) - ($\dfrac{5}{4}$ + $\dfrac{3}{4}$)

E = $\text{3 - 2}$

E = $\text{1}$