521° Вправа 521Алгебра 8 клас Тарасенкова 2025 · § 13 · стор. 156

521. Знайдіть значення виразу:

1) ${\displaystyle \sqrt{25}-\sqrt{81}=}$${\displaystyle 5-9=}$${\displaystyle -4}$;

2) ${\displaystyle \sqrt{25}+\sqrt{9}=}$${\displaystyle 5+3=}$${\displaystyle 8}$;

3) ${\displaystyle \sqrt{49}+\sqrt{0}+\sqrt{9}=}$${\displaystyle 7+0+3=}$${\displaystyle 10}$;

4) ${\displaystyle \sqrt{4}\cdot \sqrt{9}=}$${\displaystyle 2\cdot 3=}$${\displaystyle 6}$;

5) ${\displaystyle \sqrt{25}\cdot \sqrt{9}=}$${\displaystyle 5\cdot 3=}$${\displaystyle 15}$;

6) ${\displaystyle \sqrt{36}:\sqrt{4}+\sqrt{64}=}$${\displaystyle 6:2+8=}$${\displaystyle 3+8=}$${\displaystyle 11}$;

7) ${\displaystyle \sqrt{100}:2+3\cdot \sqrt{9}=}$${\displaystyle 10:2+3\cdot 3=}$${\displaystyle 5+9=}$${\displaystyle 14}$;

8) ${\displaystyle \sqrt{100}\cdot 8-5\cdot \sqrt{49}=}$${\displaystyle 10\cdot 8-5\cdot 7=}$${\displaystyle 80-35=}$${\displaystyle 45}$.