Question

Решите пж алгебра 8 класс
18 баллов

Answer 1

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

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