Объяснение:

[tex] \frac{ {x}^{2} - 6x }{ {x}^{3} - 6 {x}^{2} + 6x - 36 } = \frac{x(x - 6)}{ {x}^{2}(x - 6) + 6(x - 6) } = \frac{x(x - 6)}{(x - 6)( {x}^{2} + 6) } = \frac{x}{ {x}^{2} + 6 } [/tex]