Question

помогите пожалуйста ​

Answer 1

$2)( \frac{a + 4}{a - 4} - \frac{a - 4}{a + 4} ) \div \frac{48a}{16 - a {}^{2} } = \frac{(a + 4) {}^{2} - (a - 4) {}^{2} }{(a - 4) \times (a + 4)} \times \frac{16 - a {}^{2} }{48} = \frac{8 \div 2a}{(a - 4) \times (a + 4)} \times \frac{(4 - a) \times (4 + a)}{48} = \frac{16a}{a - 4} \times \frac{ - (a - 4) \times 1}{48} = a \times \frac{ - 1}{3} = - \frac{1}{3} a$