2³³=8¹¹=（9-1）¹¹
=C₁₁⁰9¹¹+C₁₁¹9¹⁰（-1）+…+C₁₁¹⁰9+C₁₁¹¹（-1）¹¹
=C₁₁⁰9¹¹+C₁₁¹9¹⁰（-1）+…+C₁₁¹⁰9-1
∴2³³除以9的余数是8
故答案为8