651 Вправа 651Алгебра 8 клас Бевз 2025 · § 13 · стор. 128

651. Заповни таблицю.

Якщо відоме ${\displaystyle a}$, знаходимо ${\displaystyle \sqrt{a}}$:

${\displaystyle \sqrt{0}=}$${\displaystyle 0}$, бо ${\displaystyle 0^2=}$${\displaystyle 0}$;

${\displaystyle \sqrt{\frac{1}{9}}=}$${\displaystyle \frac{1}{3}}$, бо ${\displaystyle {\left(\frac{1}{3}\right)}^2=}$${\displaystyle \frac{1}{9}}$;

${\displaystyle \sqrt{49}=}$${\displaystyle 7}$, бо ${\displaystyle 7^2=}$${\displaystyle 49}$;

${\displaystyle \sqrt{144}=}$${\displaystyle 12}$, бо ${\displaystyle 12^2=}$${\displaystyle 144}$;

Якщо відоме ${\displaystyle \sqrt{a}}$, то ${\displaystyle a=}$${\displaystyle {\left(\sqrt{a}\right)}^2}$:

${\displaystyle {\left(\frac{1}{2}\right)}^2=}$${\displaystyle \frac{1}{4}}$;

${\displaystyle 1^2=}$${\displaystyle 1}$;

${\displaystyle 4^2=}$${\displaystyle 16}$;

${\displaystyle 15^2=}$${\displaystyle 225}$;

${\displaystyle 16^2=}$${\displaystyle 256}$.