Odpowiedzi

2010-03-11T17:33:50+01:00
(-a²+2ab-1)+(a²-4ab+5) = -a²+a²+2ab-4ab-1+5= -2ab+4 =
= -2×(¼)×2+4 = -½×2+4 = -1 + 4 = 3
2010-03-11T17:33:57+01:00
((-¼)²+2*¼*2-1)+((¼)²-4*¼*2+5)= (1/16+1-1)+(1/16-2+5) = 1/16+(1/16+3)= 1/16+3i1/16= 3i2/16 = 3i1/8