Вычислите значение корня:
а) $\sqrt{810 * 40}$;
б) $\sqrt{10 * 250}$;
в) $\sqrt{72 * 32}$;
г) $\sqrt{8 * 98}$;
д) $\sqrt{50 * 18}$;
е) $\sqrt{2,5 * 14,4}$;
ж) $\sqrt{90 * 6,4}$;
з) $\sqrt{16,9 * 0,4}$.
$\sqrt{810 * 40} = \sqrt{81 * 10 * 4 * 10} = \sqrt{81 * 100 * 4} = 9 * 10 * 2 = 90 * 2 = 180$
$\sqrt{10 * 250} = \sqrt{10 * 25 * 10} = \sqrt{100 * 25} = 10 * 5 = 50$
$\sqrt{72 * 32} = \sqrt{36 * 2 * 16 * 2} = \sqrt{36 * 4 * 16} = 6 * 2 * 4 = 12 * 4 = 48$
$\sqrt{8 * 98} = \sqrt{4 * 2 * 49 * 2} = \sqrt{4 * 4 * 49} = 2 * 2 * 7 = 4 * 7 = 28$
$\sqrt{50 * 18} = \sqrt{25 * 2 * 9 * 2} = \sqrt{25 * 4 * 9} = 5 * 2 * 3 = 10 * 3 = 30$
$\sqrt{2,5 * 14,4} = \sqrt{\frac{25}{10} * \frac{144}{10}} = \sqrt{\frac{25 * 144}{100}} = \frac{5 * 12}{10} = \frac{1 * 12}{2} = 6$
$\sqrt{90 * 6,4} = \sqrt{9 * 10 * \frac{64}{10}} = \sqrt{9 * 64} = 3 * 8 = 24$
$\sqrt{16,9 * 0,4} = \sqrt{\frac{169}{10} * \frac{4}{10}} = \sqrt{\frac{169 * 4}{100}} = \frac{13 * 2}{10} = \frac{26}{10} = 2,6$
Пожауйста, оцените решение