(9³-3³):3²

Start by simplifying the expression:

(9³ - 3³) : 3²

First, calculate the exponents:

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

Now, substitute these values back into the expression:

(729 - 27) : 3²

Then perform the subtraction:

729 - 27 = 702

Now, calculate the square of 3:

3² = 3 * 3 = 9

So the expression becomes:

702 : 9

Finally, perform the division:

702 / 9 = 78

Therefore, the value of the expression (9³ - 3³) : 3² is 78.