Question

tìm x ,biết 

2 x \(+\) \(\dfrac{1}{2}\) = \(\dfrac{-5}{3}\)                        

\(\dfrac{1}{7}\) - \(\dfrac{3}{5}\) x = \(\dfrac{3}{5}\)

 

Answer 1

`2x + 1/2 = -5/3`

`=> 2x= -5/3 -1/2`

`=>2x= -13/6`

`=>x=-13/6 : 2`

`=>x=-13/6 . 1/2`

`=>x= -13/12`

`---------`

`1/7 - 3/5 x = 3/5`

`=> 3/5 x =1/7-3/5`

`=>3/5 x =-16/35`

`=>x=-16/35 : 3/5`

`=> x=-16/35 . 5/3`

`=>x= -16/21`

Answer 2

\(2x=\dfrac{-5}{3}-\dfrac{1}{2}=\dfrac{-10}{6}-\dfrac{3}{6}=\dfrac{-13}{6}\)

\(x=\dfrac{-13}{6}:2=\dfrac{-13}{6}.\dfrac{1}{2}=\dfrac{-13}{12}\)

 

\(\dfrac{3}{5}x=\dfrac{1}{7}-\dfrac{3}{5}=\dfrac{5}{35}-\dfrac{21}{35}=\dfrac{-16}{35}\)

\(x=\dfrac{-16}{35}:\dfrac{3}{5}=\dfrac{-16}{35}.\dfrac{5}{3}=\dfrac{-16}{21}\)

Answer 3