\(\frac{x}{9}=\frac{4}{x}\Rightarrow x^2=36\Rightarrow x=6\)
nhé
x/9=4/x <=>x^2-36=0=>(x+6)(x-6)=0 => \(\orbr{\begin{cases}x-6=0\\x+6=0\end{cases}=>\orbr{\begin{cases}x=6\\x=-6\end{cases}}}\)
x/9=4/x
=>x.x=8.4
=>x2=36
=>x2=(+-6)2
=>x=+-6
k đúng cho m nha
\(\frac{x}{9}=\frac{4}{x}\Rightarrow x^2=36\Rightarrow\orbr{\begin{cases}x=6\\x=-6\end{cases}}\)
Vậy x=6 hoặc x=-6
k cho mình nhé
\(\frac{x}{9}=\frac{4}{x}\)
\(\Leftrightarrow x\times x=9.4\)
\(\Leftrightarrow x^2=36\)
\(\Leftrightarrow6^2=36\)\(\Leftrightarrow x=6\)
\(v\text{ậy}\)\(x=6\)
