Question

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

Answer 1

$\frac{2x-1}{3}$∈N => 3 | 2x-1 => (2x-1)∈$D_{3}=${1;3}.

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

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

Solutia este x∈{1,2}.