Răspunsuri

2014-11-16T18:48:43+02:00

folosim regula (a+b)³=a³+3a²v+3ab²+b³
(3a+2x)³=27a³+3·9a²·2x+3·3a·4x²+8x³=27a³+54a²x+36ax²+8x³