1.

\frac{2 x^{2}+3 x+1}{3 x^{2}+4 x+1} \times \frac{4 x^{2}+5 x+1}{5 x^{2}+6 x+1} \times \frac{15 x^{2}+8 x+1}{8 x^{2}+6 x+1}=

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