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ahí queda
2/3.(3x-y)²
2/3.(3x - y). (3x - y)
2/3.(9x²-3xy-3xy +y²)
2/3.( 9x² - 6xy +y²)
18/3x² - 12/3xy + 2/3y²
6x² - 4xy + 2/3y²
➡Al final queda=
▶6x² +2/3y² - 4xy
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