Question:
Compute $121_3+2122_3-1200_3-2111_3$. Express your answer in base 3.

Answer:
It doesn't matter the order in which we add and subtract values, but we'll start with $2122_3-2111_3$ since the values are close. $$ \begin{array}{c@{}c@{\;}c@{}c@{}c@{}c} & & 2& 1 & 2 & 2_3\\ &- & 2 & 1 & 1 & 1_3\\ \cline{2-6} & & & & 1 & 1_3\\ \end{array} $$Now we're left with  $121_3-1200_3+11_3$. We add $121_3+11_3$. $$ \begin{array}{c@{}c@{\;}c@{}c@{}c@{}c} & & & 1 & 2 & 1_3\\ &+ & & & 1 & 1_3\\ \cline{2-6} & & & 2 & 0 & 2_3\\ \end{array} $$So we have $202_3-1200_3=-(1200_3-202_3)$. $$ \begin{array}{c@{}c@{\;}c@{}c@{}c@{}c} & & 1 & 2 & 0 & 0_3\\ &-& & 2 & 0 & 2_3\\ \cline{2-6} & & & 2 & 2 & 1_3\\ \end{array} $$Our answer is $\boxed{-221_3}$.