求极限underset(lim)(x→0)（((a)^x+(b)^x+(c)^x)/(3)）{}^(1)/(x)（a＞0，b＞0，c＞0）

求极限$\underset{lim}{x→0}$（$\frac{{a}^{x}+{b}^{x}+{c}^{x}}{3}$）${}^{\frac{1}{x}}$（a＞0，b＞0，c＞0）

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