Question

7/3x+1y => 7/7x+8y
Oricare ar fi x, y numere naturale

Answer 1

$\it \dfrac{7}{3x+10y}\geq\dfrac{7}{7x+8y} \Rightarrow 3x+10y\leq7x+8y \Rightarrow 10y-8y\leq 7x-3x \Rightarrow \\ \\ \\ \Rightarrow 2y\leq4x|_{:2} \Rightarrow y\leq2x$