Question

помогите (много баллов!)

Answer 1

$\frac{b}{a - b} - \frac{ {a}^{3} - a {b}^{2} }{ {a}^{2} + {b}^{2} } \times ( \frac{a}{ {(a - b)}^{2} } - \frac{b}{ {a}^{2} - {b}^{2} })= \frac{b}{a - b} - \frac{ {a}( {a}^{2} - {b}^{2}) }{ {a}^{2} + {b}^{2}} \times \frac{ {a}^{2} + {b}^{2} }{ {(a - b)}^{2} (a + b)} = \frac{b}{a - b} - \frac{a}{a - b} = \frac{b - a}{a - b} = - 1$