Question

Nếu x²=4/9, thì x bằng

Answer 1

\(x^2=\dfrac{4}{9}\)

\(\Rightarrow x^2=\left(\dfrac{2}{3}\right)^2\)

\(\Rightarrow\left[{}\begin{matrix}x=\dfrac{2}{3}\\x=-\dfrac{2}{3}\end{matrix}\right.\)

Answer 2

\(x^2=\dfrac{4}{9}\)

⇔ \(x=\sqrt{\dfrac{4}{9}}\)

⇔ \(x=\dfrac{2}{3}\)

Answer 3

\(x^2=\dfrac{4}{9}\)

\(\Rightarrow x=\dfrac{2}{3}\)