Question

помогите пожалуйста...​

Answer 1

Ответ:

4.

$a) \frac{2a - 1 + 5a}{5b} = \frac{7a - 1}{5b}$

$b)</p><p>\frac{3 - 2(x + 1)}{ {x}^{2} - 1 } = \frac{3 - 2x - 2}{ {x}^{2} - 1} = \\ = \frac{ 1- 2x}{x^{2} - 1} \\ \\ </p><p>5.</p><p>\frac{x + 4}{x - 3} \times \frac{3(x - 3)}{ {(x + 4)}^{2} } \times \frac{y(x + 4)}{15} = \\ = \frac{3y}{15} = \frac{y}{5}$

6.

$( \frac{3}{2x - 1} \times \frac{(2x - 1)(2x + 1)}{3x - 1} -\frac{6}{3x - 1}) \times \\ \times \frac{3}{2x - 1} + \frac{3x - 10}{3x - 1} = \\ = (\frac{3(2x + 1)}{3x - 1} - \frac{6}{3x - 1} )\times \\ \times \frac{3}{2x - 1} + \frac{3x - 10}{3x - 1} = \\ = \frac{3(2x - 1)}{3x - 1} \times \frac{3}{2x - 1} + \frac{3x - 10}{3x - 1} = \\ = \frac{9 + 3x - 10}{3x - 1} = \frac{3x - 1}{3x - 1} = 1</p><p>$