Problem
Evaluate: $3^{-3}=$ A. -27 B. -9 C. $\frac{1}{9}$ D. $\frac{1}{27}$
Solution
Step 1 ：\( 3^{-3} = \frac{1}{3^3} \)
Step 2 ：\( \frac{1}{3^3} = \frac{1}{3 \times 3 \times 3} \)
Step 3 ：\( \frac{1}{3 \times 3 \times 3} = \boxed{\frac{1}{27}} \)
