\frac{a^2+b^2}{ab+1} butun sonning kvadratini ifodalovchi bo'lib, \frac{a^2+b^2}{ab+1}ni ikkita kasrning yig'indisi sifatida ifodalashdan boshlashimiz mumkin: \frac{a^2+b^2}{ab+1}=\frac{a^2+2ab+b^2-2ab}{ab+1}=\frac{a+b) ^2-2ab}{ab+1}. Endi, biz ab+1 a^2+b^2ni bo'lishini ko'ramiz, ya'ni a^2+b^2=k^2k^2k^2k^2k^2k^2k^2k^2k^2k^2k^2k^2k^2k^2k
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