Question

Cần gấp

 

Answer 1

a: =>25-x/5=4/5

=>25-x=4

hay x=21

b: =>x=1/36+11/12=1/36+33/36=34/36=17/18

Answer 2

a\(\dfrac{25-x}{5}=\dfrac{112}{140}\)

<=>\(\dfrac{25-x}{5}=\dfrac{4}{5}\)

<=>25-x=4

<=>x=25-4=21

b)\(x-\dfrac{11}{12}=\dfrac{1}{36}\)

=>\(x=\dfrac{1}{36}+\dfrac{11}{12}=\dfrac{1}{36}+\dfrac{33}{36}=\dfrac{34}{36}=\dfrac{17}{18}\)