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When multiplying same bases raised to some power, the exponents are added.
For example, a² x a³ = a²⁺³ = a⁵

So for 5^ \frac{1}{3} \times 5^? = 5^1

 \frac{1}{3} + ? = 1

? = 1 - \frac{1}{3}

? =\frac{3}{3}-\frac{1}{3}

\boxed{? =\frac{2}{3}}