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Ejercicio 1.3
*Efectue en cada caso
1)
(a, b)
(a + 2*b)*(a^2 - 2*a*b + 4*b^2)
2)
(a, b)
(a - b)*(a^4 + a^3*b + a^2*b^2 + a*b^3 + b^4)