Question

решите срочно нужно​

Answer 1

$( frac{b}{ {(b + 4)}^{2} } + frac{b}{(b + 4)(b - 4)} ) times frac{ {b}^{2} + 8b + 16 }{10b} = frac{b(b - 4) + b(b + 4)}{ {(b + 4)}^{2}(b - 4) } times frac{ {(b + 4)}^{2} }{10b} = frac{ {b}^{2} - 4b {b}^{2} + 4 b}{ {(b + 4)}^{2}(b - 4) } times frac{ {(b + 4)}^{2} }{10b} = frac{2b {}^{2} }{10b(b - 4)} = frac{b}{5(b - 4)} = frac{b}{5b - 20}$