Question

Dacă x supra 3 = cu 4 supra y , y egal taiat , atunci determinati valoarea expresiei 16 - 2xy .

Answer 1

$\frac{x}{3}=\frac{4}{y} \\\\ x \cdot y= 3 \cdot 4 \\\\ \boxed{xy=12} \\\\\\ 16-2xy\to 16- 2 \cdot 12= 16-24 \Longrightarrow \boxed{\boxed{-8}}$