Question

a) 7/a + /a - 7/а+5 ​

Answer 1

Ответ:

Объяснение:

на фотографії......

Answer 2

а)

$\frac{7}{a} + \frac{a - 7}{a + 5} = \frac{7(a + 5) +a (a - 7)}{a(a + 5)} = \frac{7a + 35 + {a}^{2} - 7a }{a {}^{2} + 5a } = \\ = \frac{ {a}^{2} + 35}{ {a}^{2} + 5a }$

б)

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