Răspuns :
X²+4y+xy+4x x²+xy+4x+4y x(x+y)+4(x+y) (x+y)(x+4) x+y
____________=__________ =______________ = _________= _______
x²+7x+12 x²+4x+3x+12 x(x+4)+3(x+4) (x+4)(x+3) x+3
____________=__________ =______________ = _________= _______
x²+7x+12 x²+4x+3x+12 x(x+4)+3(x+4) (x+4)(x+3) x+3