(9³-3³):3²

To solve this expression, let's first simplify the terms inside the parentheses:

(9³ - 3³) : 3²

Calculate the cube of 9 and 3:

9³ = 9 * 9 * 9 = 729 3³ = 3 * 3 * 3 = 27

Now replace those in the original expression:

(729 - 27) : 3²

Subtract 27 from 729:

729 - 27 = 702

Now, calculate the square of 3:

3² = 3 * 3 = 9

Next, we will divide the result of the parenthesis by 3² (which is 9):

702 : 9

Divide 702 by 9:

702 ÷ 9 = 78

Therefore, the final answer to the expression (9³ - 3³) : 3² is 78.