Va rog 5 dau Corona

Răspuns:
(a³+2a²b+ab²+2b³)/b³=(a/b)³+2(a/b)²+2=
(√2-1)³+2(√2-1)²+2=(5√2-7)+2(3-2√2)+2=
5√2-7+6-4√2+2=√2+1