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desfaceți parantezele (3x+2)^3

Răspuns :

(3x+2)^3 =27x³+54x²+36x+8
(a+b)³=a³+3a²b+3ab²+b³
a³=(3x)³=27x³
3a²b=3×(3x)²×2=54x²
3ab²=3×3x×2²=36x
b³=2³=8