Question

Упростите выражение с/c-t - c+t/c^2-t^2

Answer 1

$frac{c}{c-t}- frac{c+t}{ c^{2} - t^{2} }= frac{c}{c-t}-frac{c+t}{ (c - t)(c+t) }= frac{c-1}{c-t}$
$frac{2-1}{2-0.4}= frac{1}{1.6}= frac{5}{8}$