Question

1 / x-y - 1 / x+y
срочно даю 20-30 баллов

Answer 1

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