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LeonardoSSMendes
@LeonardoSSMendes
January 2020
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Sendo a - b =1, calcule o valor da expressão a³ - b³- 3ab
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(a-b)³=a³-b³-3a²b+3ab²
(1)³=(a³-b³)+3ab(b-a)=a³-b³+(3ab).-(a-b)=a³-b³+3ab(-1)
a³-b³-3ab=1
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(1)³=(a³-b³)+3ab(b-a)=a³-b³+(3ab).-(a-b)=a³-b³+3ab(-1)
a³-b³-3ab=1