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Xw= -b/2a odcieta wierzcholka peraboli
x1+x2= -b/a wzor Viete!a
-b/a= -2+3
-b/a=1
-b=a stad
Xw=a/2a
Xw=1/2
Xw=0,5
Osia symetrii wykresu funkcji f jest prosta o rownaniu x=0,5 (odp.D)