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Definiční obor a obor hodnot 1
Všimněte si, která množina čísel na ose x tvoří definiční obor D_f a která obor hodnot H_f na ose y. Dále si všimněte, jak je daná funkce f(x)=|2x| vyjádřena grafem v kartézské soustavě souřadnic.