Question

$\frac{x + y}{ 1 + x + y} < \frac{x}{1 + x} + \frac{y}{1 + y}$
$(x + y)( \frac{1}{x} + \frac{1}{y} ) \geqslant 4$
v rogg ajutati-ma nu le inteleg!!Dau coroana promit!!Repedee

Answer 1

$\frac{x}{x + y + 1} < \frac{x}{x + 1}$
analog pt y, aduni si asta e
la a doua
$\frac{1}{x} + \frac{1}{y} > \frac{2 }{ \sqrt{xy} }$
$x + y > 2 \sqrt{xy}$
ambele din ineg mediilor, le inmultesti si asta e

Answer 2

Am atasat rezolvarea.