[tex] \frac{x^{2} }{ x^{2} +9xy} /: \frac{x}{ x^{2}-81y^{2} } [/tex]
при х=7-[tex] 9\sqrt{2} [/tex]
у=5-[tex] \sqrt{2} [/tex]
при х=7-[tex] 9\sqrt{2} [/tex]
у=5-[tex] \sqrt{2} [/tex]
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х²+9ху х²-81у² х(х+9у) х
7-9√2-9(5-√2)=7-9√2-45+9√2=7-45=-38