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Fie x,y ∈ R , ASTFEL INCAT x-2y=0. Calculati 2x² - 3xy - 2y²...va rog ssa ma ajutati..e urgent

Răspuns :

x-2y=0⇒x=2y2x² - 3xy - 2y²=2×(2y)²-3×2y×y-2y²=2×4y²-6y×y-2y²=8y²-6y²-2y²=2y²-2y²=0