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x^2-2=x
x^2-x-2=0
delta=b^2-4ac=1-4*1*(-2)=1+8=9
pierw. z delta=3
x1=(1-3)/2=-2/2=-1
x2=(1+3)/2=4/2=2
odp.
liczbą naturalną spelniajaca dane rownanie jest x=2