10) ($$\frac{1}{3}a^5y^3$$)^4 =

(\frac{1}{3}a^5y^3)^4 = (\frac{1}{3})^4 \cdot (a^5)^4 \cdot (y^3)^4 = \frac{1}{81}a^{20}y^{12}

Ответ: $$\frac{1}{81}a^{20}y^{12}$$