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a - b
a - b
---------
a²- ab
- ab + b²
________
a² - 2ab + b²
Ahora el resultado lo multiplicamos por (a-b)
a² - 2ab + b²
a - b
-------------------------
a³ - 2a²b + ab²
- a²b + 2ab²- b³
----------------------------
a³ - 3a²b + 3ab² - b³
Saludos,