Question

решить! Найти производную функции
y = (x^3 + 3) / (x^2 + x + 1)

(с решением)

Answer 1

$y = \frac{ {x}^{3} + 3}{ {x}^{2} + x + 1 } \\$

$y' = \frac{( {x}^{3} + 3)'( {x}^{2} + x + 1) - ( {x}^{2} + x + 1)'( {x}^{3} + 3) }{ {( {x}^{2} + x + 1)}^{2} } = \\ = \frac{3 {x}^{2}( {x}^{2} + x + 1) - (2x + 1)( {x}^{3} + 3) }{ {( {x}^{2} + x + 1) }^{2} } = \\ = \frac{3 {x}^{4} + 3 {x}^{3} + 3 {x}^{2} - 2 {x}^{4} - 6x - {x}^{3} - 3 }{ {( {x}^{2} + x + 1)}^{2} } = \\ = \frac{ {x}^{4} + 2 {x}^{3} + 3 {x}^{2} - 6x - 3}{ {( {x}^{2} + x + 1) }^{2} }$