Question

Помогите мне

Answer 1

Введём обозначения:

$t=frac{2}{2x-y},; v=frac{1}{x-2y}; ; to \\ left { {{t+3v=frac{1}{2}} atop {t-v=frac{1}{18}}} right. ; left { {{t=frac{1}{2}-3v} atop {t=v+frac{1}{18}}} right. ; ; to ; ; frac{1}{2}-3v=v+frac{1}{18}\\4v=frac{1}{2}-frac{1}{18}=frac{8}{18}=frac{4}{9}\\v=frac{1}{9},; ; to ; frac{1}{x-2y}=frac{1}{9}; to ; x-2y=9\\t-frac{1}{9}=frac{1}{18} ,; ; t=frac{1}{18}+frac{1}{9}=frac{3}{18}=frac{1}{6}; to frac{2}{2x-y}=frac{1}{6}; to ; 2x-y=12$

$left { {{x-2y=9} atop {2x-y=12}} right. ; left { {{x-2y=9} atop {3y=-6}} right. ; left { {{x=13} atop {y=-2}} right.$