Question

Найдите х из пропорции:

​

Answer 1

Ответ:

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

$frac{ {( {a}^{2} - 1) }^{2} }{x} = frac{ {a}^{2} - 1}{ {a}^{3} + 1 } = > \ x = frac{ {( {a}^{2} - 1) }^{2} ( {a}^{3 } + 1) }{ {a}^{2} - 1} = \ = ( {a}^{3} + 1)( {a}^{2} - 1)$