[cardinopolynomial]

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ได้
$\frac{6x^{p+q+r}+2x^{2p+q+r}+2x^{p+2q+r}+2x^{p+q+2r}+x^{2p+q+2r}+x^{2p+2q+r}+x^{p+2q+2r}+2x^{p+q}+2x^{p+r}+2x^{q+r}+x^{2p+q}+x^ {p+2r}+x^{2q+r}+x^p+x^q+x^r}{(x^{p+q}+x^q+1)(x^{p+r}+x^p+1)(x^{q+r}+x^r+1)}$