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27x a la 3 - 18xy(3x+2y) - 8y a la 3
Ahora el ejercicio:
=> (3x - 2y)^3 = (3x)^3 - (3)(3x)^2(2y) + (3)(3x)(2y)^2 - (2y)^3
........................= 3^3x^3 - (3)(3^2x^2)(2y) + (3)(3x)(2^2y^2) - (2)^3y^3
........................= 27x^3 - (3)(9x^2)(2y) + (3)(3x)(4y^2) - 8y^3
........................= 27x^3 - 54x^2y + 36xy^2 - 8y^3 => RESPUESTA.
Bueno hay vida?