Question

СРОЧНО НУЖНО!алгебра

Answer 1

Ответ:

$a) \frac{ {x}^{4} (x + 4)}{ {x}^{2}(x + 4) } = \frac{x {}^{2} (x + 4)}{(x + 4)} = \frac{( - 0.8) {}^{2}( - 0.8 + 4) }{( - 0.8 + 4)} = \frac{0.64 \times 3.2}{3.2} = 0.64$

б)

$\frac{(x - 5) {}^{2} }{(x - 5)(x + 5)} \times \frac{x(x + 5)}{7(x - 5)} = \frac{x(x - 5)}{7(x - 5)} = \frac{56(56 - 5)}{7(56 - 5)} = \frac{56 \times 51}{7 \times 51} = 8$