Question

Дайте ответ на 6 пожалуйста

Answer 1

а)

$\frac{x - y}{x} - \frac{5y}{ {x}^{2} } \times \frac{ {x}^{2} - xy }{5y} = \frac{x - y}{x} - \frac{x(x - y)}{ {x}^{2} } = \frac{x - y}{x} - \frac{x - y}{x} = 0$

б)

$( \frac{a}{ {b}^{2} - ab } + \frac{b}{ {a}^{2} - ab } ) \times \frac{ab}{b - a} = \\ = ( \frac{a}{b(b - a)} - \frac{b}{ a(b - a)} ) \times \frac{ab}{b - a} = \frac{ {a}^{2}- {b}^{2} }{ab(b - a)} \times \frac{ab}{(b - a)} = \\ = \frac{(a - b)(a + b) }{(b - a) {}^{2} } = \frac{(a - b)(a + b)}{(a - b) {}^{2} } = \frac{a + b}{a - b}$