Question

\(\dfrac{x}{9}=\dfrac{1}{x}\)

Answer 1

Vì \(\dfrac{3}{9}\) = \(\dfrac{1}{3}\)=> x=3

Answer 2

\(Từ\dfrac{x}{9}=\dfrac{1}{x}\Leftrightarrow x.x=1.9\)

\(\Leftrightarrow x^2=9\)

\(\Leftrightarrow x=3\)

Answer 3

Ta có:

\(\dfrac{x}{9}=\dfrac{1}{x}\Rightarrow x^2=9\)

\(\Rightarrow\sqrt{x^2}=x=\sqrt{9}=3\)

Vậy x = 3

CHÚC BẠN HỌC GIỎI..............................

Answer 4

Ta có \(\dfrac{x}{9}=\dfrac{1}{x}\)\(\Leftrightarrow\) x . x = 1.9

\(\Leftrightarrow\) \(x^2\)= 9 = 3\(^2\)

\(\Rightarrow\) x = 3

Vậy x = 3

Answer 5

Từ \(\dfrac{x}{9}=\dfrac{1}{x}\Rightarrow x\cdot x=1\cdot9\\ x^2=9=\left(\pm3\right)^2\\ \Rightarrow\left\{{}\begin{matrix}x=3\\x=-3\end{matrix}\right.\)

Answer 6

các bạn thiếu TH -3 nhé vì (-3)²=9 mà