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Doar b).Va roggg.Dau coronita.​

Doar BVa RogggDau Coronita class=

Răspuns :

[tex]x*y=3xy+12(x+y)+44=3xy+12x+12y+44=3xy+12x+12y+48-4=3x(y+4)+12(y+4)-4=(y+4)(3x+12)-4=3(x+4)(y+4)-4, \forall x, y, \in\mathbb{R}[/tex]