To solve this expression, we first need to simplify the terms within the parentheses:
3² = 33 = 91/7 = 1/7
(3²/21 + 11/7) = (9/21 + 1/7)(9/21 + 1/7) = (3/7 + 1/7)(3/7 + 1/7) = 4/7
Now we substitute these values back into the original expression:
3³/7 - (3/7)2= 27/7 - 6/7= 21/7= 3
Therefore, the final answer is 3.
To solve this expression, we first need to simplify the terms within the parentheses:
3² = 33 = 9
1/7 = 1/7
(3²/21 + 11/7) = (9/21 + 1/7)
(9/21 + 1/7) = (3/7 + 1/7)
(3/7 + 1/7) = 4/7
Now we substitute these values back into the original expression:
3³/7 - (3/7)2
= 27/7 - 6/7
= 21/7
= 3
Therefore, the final answer is 3.