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a=1/3
b=-1
c=2/3
Δ=b²-4ac=1-4*1/3*2/3=1-8/9=1/9
√Δ=1/3
x1=(1-1/3) przez 2/3=2/3*3/2=1
x2=(1+1/3) przez 2/3=4/3*3/2=2
odp. d