Question

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срочно!!!
дам 15 баллов ​

Answer 1

Ответ:

1) $x + 11$

2) $\frac{1}{x + 8}$

3) $x - 7$

4) $\frac{5}{x-7}$

Объяснение:

1) $\frac{(x-19)(x + 11)}{(x - 19)} = x +11$

2) $\frac{x - 8}{x^{2} - 64} = \frac{(x - 8)}{(x + 8)(x - 8)} = \frac{1}{x + 8}$

3) $\frac{x^{2} - 8x + 7}{x - 1} = \frac{(x - 1)(x - 7)}{(x - 1)} = x - 7$

4) $\frac{5x + 15}{x^{2} - 4x - 21} = \frac{5(x + 3)}{(x + 3)(x-7)} = \frac{5}{x - 7}$