Liczba 3 jest pierwiastkiem równania: 10-x3=0
x3+3x2+1=0
x3-3x2+x-3=0
(x-5)(x+1)(x+3)=0
x3+3x2+1=0
x3-3x2+x-3=0
(x-5)(x+1)(x+3)=0
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