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Daca x1 , x2 sunt solutiile ecuatiei
x la puterea a doua + 5x + 1 = 0 calculati x1 la puterea a doua + x2 la puterea a doua + x1 x x2


Răspuns :

x1²+x2²+x1x2=(x1+x2)²-x1x2=(-5)²-1=25-1=24

as Viete as that!!!