4 Вправа 4Алгебра 8 клас Бевз 2025 · § 1 · стор. 8

а) ${\displaystyle \frac{2x}{x+3}}$

${\displaystyle x+3\ne 0}$;

${\displaystyle x\ne -3}$;

б) ${\displaystyle \frac{1}{x(x-y)}}$

${\displaystyle x\ne 0}$, ${\displaystyle x-y\ne 0}$;

${\displaystyle x\ne 0}$, ${\displaystyle x\ne y}$;

в) ${\displaystyle \frac{c-x}{1+c^2{x}^2}}$

${\displaystyle 1+c^2{x}^2>0}$;

c і x — будь-які;

г) ${\displaystyle \frac{a}{a^2-1}}$

${\displaystyle a^2-1\ne 0}$;

${\displaystyle a^2\ne 1}$;

${\displaystyle a\ne \pm 1}$.