33) \(\frac{b}{(a-b)^2}+\frac2{5(a-b)}\)

\(\frac{5b+2(a-b)}{5(a-b)^2}=\frac{2a+3b}{5(a-b)^2}\).

Ответ: \(\frac{2a+3b}{5(a-b)^2}\).