Question

Найдите производную y=3x^2+2x/x+1, y’*(1)=?

Answer 1

Пошаговое объяснение:

$y' = \frac{3 {x}^{2} + 2x }{x + 1} = \frac{(3 {x}^{2} + 2x)' \times (x + 1) - (3 {x}^{2} + 2x) \times (x - 1) '}{(x + 1) {}^{2} }$

$= \frac{(6x + 2) \times (x + 1) - (3 {x}^{2} + 2x) \times 1 } { {x}^{2} + 2x + 1 } = \frac{6 {x}^{2} + 6x + 2x + 2 - 3 {x}^{2} - 2x }{ {x}^{2} + 2x + 1} = \frac{3x {}^{2} + 6x + 2 }{ {x}^{2} + 2x + 1 }$

$y(1) = \frac{3 \times {1}^{2} + 6 \times 1 + 2 }{1 + 2 + 1} = \frac{11}{4}$

Удачки)