Question

Answer 1

`5/6 + (-19)/30 = 1/x`

`5/6 - 19/30 = 1/x`

`25/30 - 19/30 = 1/x`

`(25-19)/30  =1/x`

`6/30 = 1/x`

`1/5=1/x`

`=> x = 1 :1/5`

`=> x=5`

Answer 2

\(\dfrac{1}{5}=\dfrac{1}{x}\)

\(=>x=5\)

\(Vậyx=5\)

Answer 3

\(b,\dfrac{5}{6}+\dfrac{-19}{30}=\dfrac{1}{x}\)

               \(\dfrac{1}{5}=\dfrac{1}{x}\)

\(\Rightarrow x=5\)