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1/4=0,25
1,3xy+9x^+6,5y^=1,3*[(-4)* 0,25]+9*(-4)+6,5*0,25=1,3*(-1)-36+1,625=-1,3-36+1,625=-35,675
y = 1/4
-3xy-2,5x²+4,3xy+6y²+6,5x²+0,5y²
1,3xy+4x²+6,5y²
(1.3 * -4 * 1/4) + (4 * -4)² + (6.5 * 1/4)² =
= -1.3 - 256 + 2.640625 = -254.659375 ≈ 255