Question

Вычесть c/c+4-c^2/c^2-16

Answer 1

$frac{c}{c + 4} - frac{ {c}^{2} }{ {c}^{2} - 16 } = frac{c}{c + 4} - frac{ {c}^{2} }{(c - 4)(c + 4)} = frac{ {c}^{2} - 4c - {c}^{2} }{(c - 4)(c + 4)} = - frac{4c}{ {c}^{2} - 16 }$