\(\frac{x}{3}=\frac{3}{x}\)
\(\Rightarrow x.x=3.3\)
\(\Rightarrow x^2=\left(\pm3\right)^2\)
\(\Rightarrow x=\pm3\)
\(\Rightarrow x\in\left\{3;-3\right\}\)
chúc bạn học tốt !!!
\(\frac{x}{3}=\frac{3}{x}\)
\(\Leftrightarrow x.x=3.3=9\)
\(\Leftrightarrow x^2=3^2=\left(-3\right)^2\)
\(\Leftrightarrow\orbr{\begin{cases}x=-3\\x=3\end{cases}}\)
Vậy..
hok tốt!!
\(\frac{x}{3}\)\(=\frac{3}{x}\)
\(x.x=3.3\)
\(x^2=9\)
\(\Rightarrow\orbr{\begin{cases}x^2=3^2\\x^2=\left(-3\right)^2\end{cases}}\)\(\Rightarrow\orbr{\begin{cases}x=3\\x=-3\end{cases}}\)
\(\text{Vậy}\)\(x\in\left\{3;-3\right\}\)
Hok tốt !
