Докажите тождество (p+1)(p+1)(p+1)=p³+3p²+3p+1
(p+1)(p+1)(p+1)=p³+3p²+3p+1
(p+1)³ = p³+3p²+3p+1
p³+3p²+3p+1 = p³+3p²+3p+1
использую: