Решение:

Д) $$rac{2a - 3b}{a^2b} + rac{4a - 5b}{ab^2} = $$ $$rac{(2a - 3b)b}{a^2b^2} + rac{(4a - 5b)a}{a^2b^2} = $$ $$rac{2ab - 3b^2 + 4a^2 - 5ab}{a^2b^2} = $$ $$rac{4a^2 - 3ab - 3b^2}{a^2b^2}.$$

Ответ: $$rac{4a^2 - 3ab - 3b^2}{a^2b^2}.$$

E) $$rac{x - 2y}{xy^2} - rac{2y - x}{x^2y} = $$ $$rac{(x - 2y)x}{x^2y^2} - rac{(2y - x)y}{x^2y^2} = $$ $$rac{x^2 - 2xy - 2y^2 + xy}{x^2y^2} = $$ $$rac{x^2 - xy - 2y^2}{x^2y^2}.$$

Ответ: $$rac{x^2 - xy - 2y^2}{x^2y^2}.$$