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(a+b)³ = a³ + 3a²b + 3ab² + b³
sustituimos
(2x+3y)³ = (2x)³ + 3(2x)²(3y) + 3(2x)(3y)² + (3y)³
obtenemos 8x³ + 36x²y + 54xy² + 27y³