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Utilizamos el teorema binominal
(3x^4)^3+3((3x^4)^2)*(-5x^3y)+3(3x^4)*(-5x^3y)^2+(-5x^3y)^3
recuerda que aqui debes multiplicar las potencias
entonces el resultado final es
27x^12-135X^8+34+225x^4+6y-125x^9y