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Se trata de un producto notable. Responde al desarrollo:
(a + b)^3 = a^3 +3a^2b + 3ab^2 + b^3
(3x + 5y)^3 = (3x)^3 +3(3x)^2(5y) + 3(3x)(5y)^2 + (5y)^3
(3x + 5y)^3 = 27x^3 + 135x^2y + 225xy^2 + 125y^3
buena suerte