Question

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

Answer 1

(bc-bc+c^2)/b(b-c)*b^2/c^2=c^2/b(b-c)*b^2/c^2=b/(b-c)