Question

1/3 + 2/3 : x = -7

giải giúp mình vs ạ

 

Answer 1

`1 / 3 + 2 / 3 : x = -7`

`2 / 3 : x = -7 - 1 / 3`

`2 / 3 : x = -22 / 3`

`x = 2 / 3 : -22 / 3`

`x = -1 / 11`

Answer 2

\(\dfrac{1}{2}+\dfrac{2}{3}:x=-7\)

        \(\dfrac{2}{3}:x=\left(-7\right)-\dfrac{1}{3}\)

        \(\dfrac{2}{3}:x=-\dfrac{22}{3}\)

               \(x=\dfrac{2}{3}:\left(-\dfrac{22}{3}\right)\)      

               \(x=\dfrac{2}{3}\cdot\left(-\dfrac{3}{22}\right)\)

               \(x=-\dfrac{6}{66}\)

               \(x=-\dfrac{1}{11}\)