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b=∛250=∛(125*2)=5∛2
(a+b)³ : (-4∛2+5∛2)³=(∛2)³=2
(a-b)³ : (-4∛2-5∛2)³=(-9∛2)³=-729*2= -1458
a³+a³=2a³ 2*(-∛128)³=-2*128= -256
a³-a³=0