Odpowiedzi

2010-03-05T11:16:47+01:00
-(2-y)²+(2y-x)²+(x-y)(x+y)=-(4-4y+y²)+4y²-4xy+x²+x²-y²=-4+4y-y²+4y²-4xy+x²+x²-y²=2y²+2x²-4xy-4=2×(0.5)²+2×(pierw.z 5)²-4×pierw.z5×0.5-4=0.5+10-2pierw.z5-4=6.5-2pierw.z5