Odpowiedzi

2009-10-25T18:13:04+01:00
1/2(1-2-2-4)-1/2(1-1-1+1)-(4+2-2-1)=-3,5-0-3=-6,5
2009-10-25T18:18:20+01:00
½(x-2)²-½(x-1)²-(2x-1)(2x+1)= dla x=1
½(1-2)²-½(1-1)²-(2×1-1)(2×1+1)= ½×1-½×0-1×3 = ½-0-3 = -2½