Question

сросно помогите алгебра

Answer 1

Ответ:

$( \frac{3b + 1}{3b - 1} - \frac{3b - 1}{3b + 1}) \div \frac{6 {b}^{2} }{9 {b}^{2} - 1} = \frac{(3b + 1 {)}^{2} - (3b - 1 {)}^{2} }{(3b - 1) \times (3b + 1)} \times \frac{9 {b}^{2} - 1 }{6 {b}^{2} } = \frac{2 + 6b}{(3b - 1) \times (3b + 1)} \times \frac{(3b - 1) \times(3b + 1) }{6 {b}^{2} } = 12b \times \frac{1}{6 {b}^{2} } = 2 \times \frac{1}{b}$