Question

а2-а√5/а2-5
дам 15 баллов​

Answer 1

$\frac{ {a}^{2} - a \sqrt{5} }{ {a}^{2} - 5 } = \\ = \frac{a(a - \sqrt{5}) }{(a - \sqrt{5})(a + \sqrt{5)} } = \\ = \frac{a}{a + \sqrt{5} }$