Question

Решите пж алгебра 8 класс
18 баллов

Answer 1

$1a) \sqrt{169} - 3\sqrt{0,36} = 13 - 3 \cdot 0,6 = 13 - 1,8 = 11,2\\\\1b) \sqrt{3\frac{1}{7}} \cdot \sqrt{\frac{7}{88}} = \sqrt{\frac{22\cdot7}{7\cdot88} } = \sqrt{\frac{1}{4}} = \frac{1}{2} = 0,5\\\\1c) \sqrt{2^6 \cdot 5^4} = 2^3 \cdot 5^2 = 8 \cdot 25 = 200\\\\1d) \frac{\sqrt{500}}{\sqrt{10}\cdot\sqrt{32}} = \frac{\sqrt{10} \cdot \sqrt{50}}{\sqrt{10}\cdot\sqrt{32}} = \sqrt{\frac{50}{32}} = \sqrt{\frac{25}{16}} = \frac{5}{4} = 1,25$

$2a) x^2= 13\\\\x = \pm\sqrt{13} \\\\2b) x^2 + 1 = 0\\\\ x^2 = -1\\\\ x = \sqrt{-1} = i\\\\2c) \sqrt{x} = 4 \\\\ x = 4^2 \\\\ x = 16\\\\2d) \sqrt{x} = -9\\\\x = (-9)^2\\\\ x = 81$