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Jezeli:
-1, 1, -m, m
Jezeli r=2 (1-(-1)=1+1=2)
to:
-3, -1, 1, 3
m=-3 v m=3
Jezeli r=1, to -1, 0, 1 sprzecznosc - isnieja 3 pierwiastki.
Odp. m∈{-3, 3}