Question

упростите выражение
$( frac{c}{b - c } - frac{c}{b} ) div frac{ {c}^{2} }{ {b}^{2} }$

Answer 1

$( frac{c}{b-c} - frac{c}{b}) : frac{c^2}{b^2} = frac{bc - (bc - c^2)}{b(b-c)} * frac{b^2}{c^2} = frac{c^2}{b(b-c)} * frac{b^2}{c^2} = frac{b}{b - c}$