Răspunsuri

2014-09-20T21:00:33+03:00
Xy-2x-2y+6=(x-2)(y-2)+2
Stim ca x>2=> x-2>0 si y>2=> y-2>0. Deci (x-2)(y-2)>0=> (x-2)(y-2)+2>2=> xy-2x-2y+6>2
2 4 2