\( \sqrt{\frac{1}{4}x^8y^4} \) при \(x=2, y=3\);

\( \sqrt{\frac{1}{4}x^8y^4} = \sqrt{\frac{1}{4}(2^8)(3^4)} = \sqrt{\frac{1}{4}256 \cdot 81} = \sqrt{5184} = 72.\)