Question

\(\dfrac{x}{2}\)=\(\dfrac{9}{2x}\)

Answer 1

`x/2 = 9/(2x)`

`2x^2 = 2*9`

`x^2 = 9`

`x^2 = (+-3)^2`

`=> x=+-3`

Vậy `x=+-3`

Answer 2

\(\dfrac{x}{2}=\dfrac{9}{2x}\\ \Rightarrow2x^2=18\\ \Rightarrow x^2=18:2=9\\ \Rightarrow x=3\)

Answer 3

x.2x=9.2

x².2=18

x²=9

x²=3²

x=3

Answer 4

\(< =>x\cdot2x=9\cdot2=2x^2=18< =>x^2=9< =>x\in\left\{-3;3\right\}\)

Answer 5

\(\Rightarrow2x.x=2.9\)

\(\Leftrightarrow3x=18\)

\(\Leftrightarrow x=6\)

Answer 6

x2=92x⇒2x2=18⇒x2=18:2=9⇒x=3

Answer 7

x2=92x⇒2x2=18⇒x2=18:2=9⇒x=3