Question

100баллов помогите плез

Answer 1

а)

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

б)

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

в)

$= 2(x - y) \times \frac{3y}{(x - y)(x + y)} = 2 \times \frac{3y}{x + y} = \frac{6y}{x + y}$

г)

$= \frac{(a - 2)(a + 2)}{2a} \times \frac{4 {a}^{2} }{3a + 6} = (a - 2)(a + 2) \times \frac{2a}{3(a + 2)} = (a - 2) \times \frac{2a}{3} = \frac{2 {a}^{2} - 4a }{3}$