Tính:
\(S=\frac{\left(1^4+\frac{1}{4}\right).\left(3^4+\frac{1}{4}\right).\left(5^4+\frac{1}{4}\right).....\left(19^4+\frac{1}{4}\right)}{\left(2^4+\frac{1}{4}\right).\left(4^4+\frac{1}{4}\right).\left(6^4+\frac{1}{4}\right)....\left(20^4+\frac{1}{4}\right)}\)
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