Question

помогите с алгеброй))) при а=1

Answer 1

$frac{1}{ {a}^{2} - 4} = frac{1}{(a - 2)(a + 2)}$
$frac{1}{(a - 2)(a + 2)} times frac{ {(a +2)}^{2} }{a} = \ = frac{a + 2}{(a - 2)a} = frac{a + 2}{ {a}^{2} - 2a }$

Answer 2

1/ (a^2 -4) * (a+2)^2 / a= 1/ (a-2)(a+2) * (a+2)^2 = 1 / (a-2) * (a+2) / a = (a+2) / (a^2 - 2a)