underset(lim)(n→∞)（14n+2(}^{^3n)+32n+4n）{}^(1)/(n)= ____ ．

$\underset{lim}{n→∞}$（1⁴ⁿ+2${}^{{}^{3n}}$+3²ⁿ+4ⁿ）${}^{\frac{1}{n}}$= ____ ．

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