Lời giải:
\[
\begin{array}{l}
A = \frac{{\left( {1^4 + \frac{1}{4}} \right)\left( {3^4 + \frac{1}{4}} \right)...\left( {11^4 + \frac{1}{4}} \right)}}{{\left( {2^4 + \frac{1}{4}} \right)\left( {4^4 + \frac{1}{4}} \right)...\left( {12^4 + \frac{1}{4}} \right)}} = \frac{{\left( {4.1^4 + 1} \right)\left( {4.3^4 + 1} \right)\left( {4.5^4 + 1} \right)...\left( {4.11^4 + 1} \right)}}{{\left( {4.2^4 + 1} \right)\left( {4.4^4 + 1} \right)\left( {4.6^4 + 1} \right)...\left( {4.12^4 + 1} \right)}} \\
= \frac{{1.5.13.25.41.61.....221.265}}{{5.13.25.41.61.85.....265.313}} = \frac{1}{{313}} \\
\end{array}
\]
Luôn yêu để sống, luôn sống để học toán, luôn học toán để yêu!!!
$$\text{LOVE}\left( x \right)|_{x = \alpha}^\Omega = + \infty $$
I'm still there everywhere.