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Cel mai inteligent răspuns!
2014-08-24T18:17:33+03:00
Uite se scrie asa 
4x^2 +9y^2-4x+12y+5=0
(4x²-4x+1)+(9y²+12y+4)=0
(2x-1)²+(3y+2)²=0
2x-1=0
x=1/2
3y+2=0
y=-2/3
3 4 3