Question

Answer 1

=>x-2/3=7/2 hoặc x-2/3=-7/2

=>x=25/6 hoặc x=-17/6

Answer 2

\(\left(x-\dfrac{2}{3}\right)^2=\dfrac{49}{4}\\ \Leftrightarrow\left(x-\dfrac{2}{3}\right)^2=\left(\pm\dfrac{7}{2}\right)^2\\ \Leftrightarrow\left[{}\begin{matrix}x-\dfrac{2}{3}=\dfrac{7}{2}\\x-\dfrac{2}{3}=-\dfrac{7}{2}\end{matrix}\right.\\ \Leftrightarrow\left[{}\begin{matrix}x=\dfrac{25}{6}\\x=-\dfrac{17}{6}\end{matrix}\right.\)

Answer 3

`=> x - 2/3 = +-7/2`

`=> x = 25/6` hoặc `-17/6`