Question

Найдите х из пропорции:

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Answer 1

Ответ:

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

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