Question

x/9 = 4/x

Answer 1

Ta có :\(\frac{x}{9}=\frac{4}{x}\)

\(\Rightarrow x.x=9.4\)

\(\Rightarrow x^2=36\)

\(\Rightarrow x=6\)

Vậy : x=6

Answer 2

\(\frac{x}{9}=\frac{4}{x}\)

=>\(x.x=4.9\)

=>\(x^2=36\)

=>\(x\varepsilon\left\{6;-6\right\}\)

Vậy \(x\varepsilon\left\{6;-6\right\}\)

k nha