Answer:
x^(-1/12)y^(-19/8)
Explanation:
There are three rules of exponents that apply here:
(a^b)(a^c) = a^(b+c)
(a^b)^c = a^(b·c)
1/a^b = a^-b
Using these rules the expression simplifies as ...

So, the simplified expression is ...
x^(-1/12)y^(-19/8)