Răspuns:
[tex]2x - 10y - 11z = 0 \\ 2(x - 5y) = 11z \\ \implies \bf \ z \ \ \vdots \ 2[/tex]
[tex]2x-10y-11z=0 \\ 2x + y - 11y - 11z = 0 \\ 2x + y = 11(y + z) \\ \bf z(2x + y) = 11z(y + z)[/tex]
[tex]\implies 11z(y + z) \bf \: \: \vdots \: 11[/tex]
dar z este număr par:
[tex]\implies \bf 11z(y + z) \: \: \vdots \: 22[/tex]
adică:
[tex]\implies \bf \red{22 \ \Big| \: z(2x + y)}[/tex]
q.e.d.
