Răspunsuri

2014-09-23T11:31:22+03:00
X²-6x+9+y²+2y+1+2(x-3)(y+1)=
(x-3)²+(y+1)²+2(x-3)(y+1)=[(x-3)+(y+1)]²=(x-3+y+1)²=(x+y-2)²
2 3 2