1) x³y³ + 1 = (xy + 1)(x²y² - xy + 1); 2) 27 - a³b³ = (3 - ab)(9 + 3ab + a²b²)
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1) x³y³ + 1 = (xy + 1)(x²y² - xy + 1); 2) 27 - a³b³ = (3 - ab)(9 + 3ab + a²b²)