Question

преобразуйте в дробь выражение

Answer 1

$\frac{x}{x - 1} + \frac{x}{x + 1} = \\ = x \cdot( \frac{1}{x - 1} + \frac{1}{x + 1} ) = \\ = x \cdot \frac{x + 1 + x - 1}{(x - 1)(x + 1)} = \\ = \frac{2 {x}^{2} }{ {x}^{2} - 1 }$