258. $\left(a^{m}\right)^{\frac{1}{n}} ;\left(a^{\frac{1}{n}}\right)^{\frac{n}{m}} ;\left(a^{n} b\right)^{\frac{1}{n}} ;\left(a^{n} b^{m}\right)^{\frac{1}{m n}} ;\left(\frac{a^{n}}{b^{m}}\right)^{\frac{1}{m n}}$.

Problems from an anonymous Italian manuscript of the 14th century.
258. $a^{\frac{m}{n}} ; a^{\frac{1}{m}} ; a b^{\frac{1}{n}} ; a^{\frac{1}{m}} \cdot b^{\frac{1}{n}} ; \frac{a^{\frac{1}{m}}}{b^{\frac{1}{n}}}$.

258. $a^{\frac{m}{n}} ; a^{\frac{1}{m}} ; a b^{\frac{1}{n}} ; a^{\frac{1}{m}} \cdot b^{\frac{1}{n}} ; \frac{a^{\frac{1}{m}}}{b^{\frac{1}{n}}}$.

The text is already in a form that is both mathematical and symbolic, and the symbols and expressions are universal. Therefore, the translation is identical to the original text.