Question

Помогите пожалуйста, если не трудно
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Answer 1

Ответ:

$\frac{3}{x - 3} - \frac{x + 15}{(x - 3)(x + 3)} - \frac{2}{x} = \\ = \frac{3x(x + 3) - x(x + 15) - 2(x - 3)(x + 3)}{x(x - 3)(x + 3)}$

$= \frac{ {3x}^{2} + 9x - {x}^{2} - 15x - 2 {x}^{2} + 18 }{x(x - 3)(x + 3)} = \\ = \frac{ - 6x + 18}{x(x - 3)(x + 3)} = \frac{ - 6(x - 3)}{x(x - 3)(x + 3)} = - \frac{6}{x(x + 3)}$