Odpowiedzi

2009-11-26T16:07:37+01:00
(a -b)(a2+ab+b2) =a3+a2b+ab2-a2b-ab2-b3=a3-b3

(x2+x+1)(x2 -x +1)= x4-x3+x2+x3-x2+x+x2-x+1=x4+x2+1
2009-11-26T16:07:17+01:00
(a-b)(a²+ab+b²) = a³+a²b + ab² -a²b - ab² - b³ = a³+b³
(x²+x+1)(x²-x+1) = x⁴ - x³ + x² + x³ - x² + x + x² - x + 1 =
x⁴ + x² + 1