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3 (a) Gitt funksjonene f1(x, y) = 3 . x - y, f2(x, y) = -5. y. Vi definerer vektorene f = f1(x, y) f2
3 (a) Gitt funksjonene f1(x, y) = 3 . x - y, f2(x, y) = -5. y. Vi definerer vektorene f = f1(x, y) f2 (x, y), ogu = Finn en matrise A sann at f = A . u. (b) Gitt det lineare ligningssystemet 5 = 5 . x1 +9 . 22, (1) 0 = 4 . x1 - 6 .2-4 1 og vektoren x = 20 2 Finn en vektor b E R2 og en matrise B E R2x2 sann at (1) kan skrives som B . x =b
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