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Ob=d=2a+2b
a=x , x>0
d(x)=2x+2S/x = (2x²+2S)/x
d'(x)=(4x*x - 2x²-2S)/x² = (2x²-2S)/x²
(2x²-2S)=0
x=√S
Odp. Funkcja ma tylko wartosc najmniejsza dla a=b=√S.
Jest to kwadrat o boku a=√S.