Odpowiedzi

2010-02-16T19:57:44+01:00
(-a2+2ab-1)+(a2-4ab+5)=-a2+2ab-1+a2-4ab+5=-2ab+4= -2x(1/4x2)+4=3
2010-02-16T19:57:44+01:00
(-a2+2ab-1)+(a2-4ab+5) dla a=1/4 b=2
to a2 oznacz że jest do kwadratu

[-(1/4)^2+2*(1/4)*2-1]+[(1/4)^2-4*(1/4)*2+5]=
[(-1/16)+1-1]+[(1/16)-2+5]=(-1/16)+(1/16)-2+5=3
2010-02-16T19:59:27+01:00
(-a2 + 2ab -1) + (a2 - 4ab + 5 ) = -a2 + 2ab -1 + a2 - 4ab +5 = -2ab + 4 = -2 x ( 1/4 x 2) + 4 = -2 x 0,5 + 4 = -1 + 4 = 3