Question

F(x) = x +1/2 f(✓2) =?

Answer 1

$f(x)=x+\dfrac{1}{x} \\\\f'(x)=1-\dfrac{1}{x^2} \\\\f'(\sqrt{2})=1-\dfrac{1}{\sqrt{2}^2 } =1-\dfrac{1}{2} =\dfrac{1}{2}$

Ответ: В