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f: R -> R; f(x) = 3x-5
Calculați f(√7)-f(√5) supra √7-√5

VĂ ROG!!!!​


Răspuns :

[tex]\it \dfrac{f(\sqrt7)-f(\sqrt5)}{\sqrt7-\sqrt5}=\dfrac{3\sqrt7-5-3\sqrt5+5}{\sqrt7-\sqrt5}=\dfrac{3(\sqrt7-\sqrt5)}{\sqrt7-\sqrt5}=3[/tex]