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(Mª-Nb)^3 = (M)^3.a - 3(M)2.a(Nb) + 3(Mª)(N)^2b - (N)^3b
Espero te sirva de ayuda lo poco que sé (:
Solo se que hay dos maneras de sacar al cubo
1.- (a-b)^3 = (a)^3 - 3(a^2)(b) + 3(a)(b)^2 - (b)^2
2.- (a-b)^3 = (a-b)(a^2 + ab + b^2)