👤

Determinati x din Z stiind ca
[tex] \frac{13}{2x-1} [/tex]
-mie mi-a dat ca x=7 proba: [tex] \frac{13}{2\cdot7-1}=\boxed1 [/tex] care apartine lui Z


Răspuns :

[tex] \frac{13}{2x-1} \in Z \Rightarrow 2x-1~|~13 \Rightarrow~(2x-1) \in D_{13} = \{ -13;~-1;~1;~13 \}. \\ \\ 2x-1=-13 \Rightarrow \boxed{x=-6 }~. \\ \\ 2x-1=-1 \Rightarrow \boxed{x=0}~. \\ \\ 2x-1=1 \Rightarrow \boxed{x=1}~. \\ \\ 2x-1=13 \Rightarrow \boxed{x=7}~. \\ \\ \underline{Solutie}:~x \in \{-6;0;1;7\}.[/tex]