Cho biết \(\dfrac{-2}{3}x=\left(\dfrac{-1}{3}\right)^2\), khẳng định nào sau đây là đúng?
\(x=\dfrac{1}{6}\).\(x=\dfrac{-2}{27}\).\(x=-\dfrac{1}{6}\).\(x=\dfrac{2}{27}\).Hướng dẫn giải:\(\dfrac{-2}{3}x=\left(\dfrac{-1}{3}\right)^2\)
\(\dfrac{-2}{3}x=\dfrac{1}{9}\)
\(x=\dfrac{1}{9}:\left(\dfrac{-2}{3}\right)\)
\(x=\dfrac{-1}{6}.\)
