Answer
$21$
Work Step by Step
Solve using PEMDAS (The priority list for solving expressions: Parentheses, exponents, [multiplication, division], [addition, subtraction]. For the operations in the brackets, solve from left to right)
$\dfrac{9^2+2^2-1^2}{8\div2\cdot 3\cdot 1\div3} = \dfrac{81+4-1}{8\div2\cdot 3\cdot 1\div3} = \dfrac{81+4-1}{4} = \dfrac{84}{4} = 21$
