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2x²-5x+2=0
delta=25-4*4=25-16=9
pierwiastek z delty =3
x₁=(5+3)/4=2
x₂=(5-3)/4=1/2
punkty przeciecia sie z osia Y
2x²-5x+2=y
2*0-5*0+2=y
y=2
xw=5/4
yw=-3/8