Найдите производное f(x)=2/x-√7x
[m]f`(x)=(\frac{2}{x}-\sqrt{7}x)`=(\frac{2}{x})`-(\sqrt{7}x)`=2(x^{-1})`-\sqrt{7}(x)`=2\cdot(-1)\cdot x^{-1-1}-\sqrt{7}=-2\cdot\cdot x^{-2}-\sqrt{7}=-\frac{2}{x^2}-\sqrt{7}[/m]
