Odpowiedzi

2009-11-12T20:02:02+01:00
(a-1)^4:
(a-1)(a-1)(a-1)(a-1)=(a-1)²(a-1)²=(a²-2a+1)(a²-2a+1)=(a²-2a+1)²

(a²-2a+1)(a²-2a+1)=a⁴-2a³+a²-2a³+4a²-2a+a²-2a+1=a⁴-4a³+6a²-4a+1
4 3 4