Question

Срочно!!!!!!!!!!!!!!!​

Answer 1

Объяснение:

1)

$\frac{5b}{28} + \frac{9b}{28} = \frac{14b}{28} = \frac{1}{2} b$

2)

$\frac{9m}{7n} - \frac{2m}{7n} = \frac{7m}{7n} = \frac{m}{n}$

3)

$\frac{5x - 3y}{8z} + \frac{3x - 13y}{8z} = \frac{5x - 3y + 3x - 13y}{8z} = \frac{8x - 16y}{8z}$ = x-2/z

4)

$\frac{4c - 3d}{cd} - \frac{c - 3d}{cd} = \frac{3c}{cd} = \frac{3}{d}$

5)

$\frac{6x}{ {x}^{2} - 16 } - \frac{24}{ {x}^{2} - 16} = \frac{6(x - 4)}{(x - 4)(x + 4)} = \frac{6}{x + 4}$

6)

$\frac{ {m}^{2} + 10m }{9 - {m}^{2} } - \frac{4m - 9}{9 - {m}^{2} } = \frac{ {m}^{2} + 6m + 9}{9 - {m}^{2} } = \frac{(m + 3 {)}^{2} }{(m + 3)(m - 3)} = \frac{m + 3}{3 - m}$