`(3/5 x - 1/2) : 5/6 = 3/7 - 2 1/4`
`(3/5 x - 1/2) : 5/6 = 3/7 - 9/4`
`(3/5 x - 1/2) : 5/6 = (-51)/28`
`3/5 x - 1/2=(-51)/28 xx 5/6`
`3/5 x - 1/2= (-85)/56`
`3/5 x = (-85)/56 + 1/2`
`3/5 x = (-85)/56 + 28/56`
`3/5 x =(-57)/56`
`x = (-57)/56 : 3/5`
`x = (-57)/56 xx 5/3`
`x = (-95)/56`
Vậy `x = (-95)/56`
c) \(\left(\dfrac{3}{5}x-\dfrac{1}{2}\right):\dfrac{5}{6}=\dfrac{3}{7}-\dfrac{9}{4}\)
\(\left(\dfrac{3}{5}x-\dfrac{1}{2}\right):\dfrac{5}{6}=\dfrac{-51}{28}\)
\(\left(\dfrac{3}{5}x-\dfrac{1}{2}\right)=\dfrac{-51}{28}.\dfrac{5}{6}\)
\(\left(\dfrac{3}{5}x-\dfrac{1}{2}\right)=\dfrac{-85}{56}\)
\(\dfrac{3}{5}x=\dfrac{-85}{56}+\dfrac{1}{2}\)
\(\dfrac{3}{5}x=\dfrac{-57}{56}\)
\(x=\dfrac{3}{5}:\dfrac{-57}{56}\)
\(x=\dfrac{-95}{56}\)
vậy x = ...
b) \(\dfrac{2}{3}-x=\dfrac{11}{7}-\dfrac{11}{4}\)
\(\dfrac{2}{3}-x=\dfrac{-33}{28}\)
\(x=\dfrac{2}{3}-\dfrac{-33}{28}\)
x = \(x=\dfrac{155}{84}\)
vậy x = ...
