Question

x pe 3 = 27 pe 39. x = ?

Answer 1

X/3=27/39
X=27/39×3/1
X=27×3 totul supra/39×1
X=81/39 simplificat cu 3
X=27/13

X/3=27/39 simplificat cu 3
X/3=9/13
X=9/13 ×3/1
X=9×3 totul supra/13×1
X=27/13

Answer 2

I...  
$\frac{x}{3}=\frac{27}{39}\;\;;\;\;x=\frac{3\cdot27^{(3}}{39}=\frac{27}{13}=2\frac{1}{13}$

II...  
$\frac{x}{3}=\frac{\;\;\;27^{(3}}{39}\Rightarrow\;\frac{x}{3}=\frac{9}{13}\Rightarrow\;x=\frac{3*9}{13}=\frac{27}{13}\;;$