Question

Алгебра, 8 класс!! СРОЧНО​

Answer 1

Ответ:

1 25,2

2 3,3

 

Пошаговое объяснение:

210=3

Answer 2

Ответ:

$1) (\frac{b}{a^2})^2 = \frac{b^2}{a^4}$

$2) (-\frac{3x^2}{y^2})^3 = -\frac{27x^6}{y^6}$

$3) (\frac{m^4}{n^3})^2 = \frac{m^8}{n^6}$

$4) (\frac{25a^2}{8b^2})^3  = \frac{15625a^6}{512b^6}$

$5) \frac{32ab}{13c^3} * \frac{52bc^2}{128a^3} * \frac{54a^2c}{81b^3} : \frac{5}{18c} = \frac{32ab*52bc^2*54a^2c*18}{13c^3*128a^3*81b^3*5} = \frac{32*a*b*52*b*c^2*54*a^2*c*18}{13*c^3*128*a^3*81*b^3*5} = \\\\ \frac{32*a^3*b^2*c^3*4*13*6*9*18}{13*c^3*4*32*a^3*b^3*9*9*5} = \frac{6*18}{9*5b} = \frac{6*2}{5b} = \frac{12}{5b} = 2,4b$

$6) \frac{x+3}{x^2+9} * (\frac{x+3}{x-3} + \frac{x-3}{x+3}) = \frac{x+3}{x^2+9}} * (\frac{(x+3)^2 + (x-3)^2}{x^2 - 9}) = \frac{x+3}{x^2+9}} * (\frac{x^2+6x+9+x^2-6x+9}{x^2 - 9}) = \\\\ \frac{x+3}{x^2+9} * \frac{2x^2+18}{x^2-9} = \frac{(x+3)*2(x^2+9)}{(x^2 + 9)(x-3)(x+3)} = \frac{x^2+9}{x-3}$