Odpowiedzi

2010-02-28T17:58:41+01:00
A) (a-b)(a² + ab + b²)=a³+a²b+ab²-a²b-ab²-b³=a³-b³
b) (x² + x + 1)(x² - x +1)=x⁴-x³+x²+x³-x²+x+x²-x+1=x⁴+x²+1
c) (x+1)(x³ - x² + x - 1)=x⁴-x³+x²-x+x³-x²+x-1=x⁴-1
d) (x+1)(x³ - x² + x - 1)=x⁴-x³+x²-x+x³-x²+x-1=x⁴-1