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2*½- (2*-½-4)=1-(-5)=6
v²-2xz dla y= √2,x=¼, z=-2
2-(2*¼*-2)=2-(-1)=3
podstawiamy. 2 - 2*1/4 * (-2) = 2 - (-1) = 2+1 = 3
6-3=3
odp. 3 ;-)