Answer:
-243
Step-by-step explanation:
[tex]\tt\displaystyle (-3)^{-3}:(-3)^{-8}=\frac {1}{(-3)^{3}}:\frac{1}{(-3)^{8}}=\frac {1}{(-3)^{3}}*(-3)^{8}=\frac{(-3)^{8}}{(-3)^{3}}=(-3)^{8-3}=(-3)^{5}=-243[/tex]
