Answer:
9
Explanation:
You want the least common denominator for the fraction in the sum ...
(2/3)² -1/3
Simplify
When the sum is simplified, it is ...
4/9 -1/3
The denominator 9 is a multiple of the denominator 3, so the least common denominator of these two fractions is 9.
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Additional comment
Using that denominator, the sum is ...
4/9 -3/9 = 1/9
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