Resposta :

poty
(2r + 3a)³ = (2r)³ + 3(2r)².(3a) + 3(2r).(3a)² + (3a)³ =
8r³ + 3.4r².3a + 6r (9a²) + 27a³ =
8r³ + 36r²a + 54ra² + 27a³ 
3478elc
(2r + 3a)^3 =
(2r)^3 + 3(2r)^2.(3a) + 3(2r).(3a)^2 + (3a)^3 =
8r^3 + 3.4r^2.3a + 6r (9a^2) + 27a^3 =
8r^3 + 36r^2a + 54ra^2 + 27a^3 

Outras perguntas