Question

Tìm x biết:

(50%.x+5\(\dfrac{1}{4}\)).\(\dfrac{-2}{3}\)=2\(\dfrac{5}{6}\)

Answer 1

`(50% . x+5 1/4) . (-2/3) = 2 5/6`

`(1/2 x + 21/4) . (-2/3) = 17/6`

`1/2 x + 21/4 = -17/4`

`1/2 x = -19/2`

`x=-19`

Answer 2

\(^{^{tham}}\) \(^{^{khảo}}\)

\(\left(50\%.+5\dfrac{1}{4}\right).\left(-\dfrac{2}{3}\right)=2\dfrac{5}{6}\)

\(\left(\dfrac{1}{2}x+\dfrac{21}{2}\right).\left(-\dfrac{2}{3}\right)=\dfrac{17}{6}\)
\(\dfrac{1}{2}x+\dfrac{21}{4}=-\dfrac{17}{4}\)

\(\dfrac{1}{2}x=-\dfrac{19}{2}\)

\(x=-19\)

Answer 3

\(\left(50\%.x+5\dfrac{1}{4}\right).\dfrac{-2}{3}=2\dfrac{5}{6}\) 

                 \(\dfrac{1}{2}.x+\dfrac{21}{4}=\dfrac{17}{6}:\dfrac{-2}{3}\) 

                 \(\dfrac{1}{2}.x+\dfrac{21}{4}=\dfrac{-17}{4}\) 

                           \(\dfrac{1}{2}.x=\dfrac{-17}{4}-\dfrac{21}{4}\) 

                           \(\dfrac{1}{2}.x=\dfrac{-19}{2}\) 

                                \(x=\dfrac{-19}{2}:\dfrac{1}{2}\) 

                                \(x=-19\)