Answers

2014-07-14T15:16:26+08:00
(a + b)³ = a³ + 3a²b + 3ab² + b³
(a - b)³ = a³ - 3a²b + 3ab² - b³

a³ + b³ =  (a + b)(a² - ab + b²)
a³ - b³ =  (a - b)(a² + ab + b²)
0