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Sagot :
As we know :
- [tex] \boxed{ \boxed{ {(a + b)}^{3} = {a}^{3} + {b}^{3} + 3ab(a + b) }}[/tex]
now let's plug the value of given terms :
- (5)³ = a³ + b³ + (3×3)(5)
- 125 = a³ + b³ + 45
- a³ + b³ = 125 - 45
- a³ + b³ = 80
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