Докажите тождество СРОЧНО ДАЮ 45 БАЛЛОВ
[tex] \frac{a - b} {{a}^{2} + ab } + ( \frac{ \sqrt{a} }{ \sqrt{a} - \sqrt{b} } - \frac{ \sqrt{b} }{ \sqrt{a} + \sqrt{b} } ) = \frac{1}{a} [/tex]
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