Question

упростите выражение (а/6-6/а)*(1/6+а + 1/6-а)

Answer 1

$= \frac{a {}^{2} - 36 }{6a {}^{} } \times \frac{6 - a + 6 + a}{(6 + a)(6 - a)} = \frac{(a - 6)(a + 6)}{6a} \times \frac{12}{(6 +a) \times ( - (a - 6)) } = - \frac{1}{a} \times 2 = \ - \frac{2}{a}$