Odpowiedzi

2009-12-01T17:30:39+01:00
A) n²(n+1)(n²-1) = n²(n³-n+n²-1)=n⁶-n³+n⁴-n²
b)(a-b)(a²+ab+b²)=a³+a²b+ab²-a²b-ab²-b³=a³-b³
c)(x²+x+1)(x²-x+1) =x⁴-x³+x²+x³-x²+x+x²-x+1=x⁴+x²+1