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afla x stiind ca 2x-1/3 aparine numerelor naturale

Răspuns :

[tex] \frac{2x-1}{3} [/tex]∈N => 3 | 2x-1 => (2x-1)∈[tex] D_{3}= [/tex]{1;3}.

2x-1=1 => 2x=2 => x=1.

2x-1=3 => 2x=4 => x=2.

Solutia este x∈{1,2}.