Question

x/4=9/x

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Answer 1

\(\frac{x}{4}=\frac{9}{x}\Rightarrow x\cdot x=9\cdot4\)

=>x²=36

=>\(x=\sqrt{36}hoac-\sqrt{36}\)

Answer 2

chết mk nhầm để mk làm lại

Answer 3

\(\frac{x}{4}=\frac{9}{x}\Rightarrow x.x=9.4\Rightarrow x^2=36\Rightarrow\sqrt{x}=\sqrt{36}\Rightarrow x=6\)

(Nhớ k cho mình với nhé!)

Answer 4

Vì \(\frac{x}{4}=\frac{9}{x}\Rightarrow x.x=4.9\Rightarrow x^2=36\Rightarrow x\in\left\{6;-6\right\}\)

Answer 5

\(\frac{x}{4}=\frac{9}{x}\Rightarrow x\cdot x=9\cdot4\)

\(\Rightarrow x^2=36\)

\(\Rightarrow\hept{\begin{cases}x=\sqrt{36}\\x=-\sqrt{36}\end{cases}\Rightarrow}x=\pm6\)