Fatore o numerador e o denominador, simplificando as expressões:
x³ + 3x²y + 3xy² + y³
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x³ + y³
x³ + 3x²y + 3xy² + y³
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x³ + y³
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x³ +y³ => (x+y) (x²-xy+y²)
(x+y)³
------------------------------- = (x+y)²
(x+y) (x²-xy+y²) resposta final --------------------------
(x²-xy+y²)