Question

(1/а-1/b):b^2-a^2/ab^2

Answer 1

$(frac{1}{a} - frac{1}{b}):b^2- frac{a^2}{ab^2}= frac{b-a}{ab*b^2}- frac{a}{b^2}= frac{a-b-a^2b}{ab^3}$