Question

Demonstrati ca √3 + √9 < √5 + √7

Answer 1

ridici la patrat in ambele parti si obtii
3+9+2*$\sqrt{3} * \sqrt{9} =5+7+2* \sqrt{5} * \sqrt{7} \ \textless \ =\ \textgreater \ 12+2 \sqrt{27}=12+2 \sqrt{35}$
dupa reducere obti
$\sqrt{27}\ \textless \ \sqrt{35}$
coronita?