[tex]\left \{ \begin{array}{l} f:\mathbb Q^{+} \to \mathbb R^{+} \\\\ f(x)+ f(y)- f(x+y)= \dfrac{x^2 + xy + y^2}{xy(x+y)} \to f_{\rm min}(1)=? \\\\ f(x)\geqslant 1 ~ , ~ \forall x \in \mathbb R^{+} \end{array}[/tex]
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