794 Вправа 794Алгебра 8 клас Бевз 2025 · § 16 · стор. 152

794. Спрости вираз.

а) ${\displaystyle 5\sqrt{c}-2\sqrt{c}+6\sqrt{c}=}$${\displaystyle 9\sqrt{c}}$;

б) ${\displaystyle 7\sqrt{y}-\sqrt{y}+3\sqrt{y}=}$${\displaystyle 9\sqrt{y}}$;

в) ${\displaystyle \sqrt{16a}+\sqrt{81a}-\sqrt{169a}}$=

=${\displaystyle 4\sqrt{a}+9\sqrt{a}-13\sqrt{a}=}$${\displaystyle 0}$;

г) ${\displaystyle \sqrt{25b}-\sqrt{81b}+3\sqrt{b}}$=

=${\displaystyle 5\sqrt{b}-9\sqrt{b}+3\sqrt{b}=}$${\displaystyle -\sqrt{b}}$.