Question

. помогите пожалуйста срочно надо ((​

Answer 1

Ответ:

$(2 {}^{ - 3} ) {}^{2} = 2 {}^{ - 6} = \frac{1}{2 {}^{6} } = \frac{1}{64}$

$\frac{x }{x + 5} + \frac{5}{x + 5} = \frac{x + 5}{x + 5} = 1$

$\sqrt{81} - 2 \sqrt{0.36} = 9 - 2 \sqrt{ \frac{9}{25} } = 9 - 2 \times \frac{3}{5} = 9 - \frac{6}{5} = \frac{39}{5} = 7 \frac{4}{5}$

$2x {}^{2} - x - 10 = 0 \\ a = 2 \\ b = - 1 \\ c = - 10 \\ ( - 1) {}^{2} - 4 \times 2 \times ( - 10) = 81$