e) $$\frac{2\sqrt{3}-3}{5\sqrt{3}} = \frac{2\sqrt{3}}{5\sqrt{3}} - \frac{3}{5\sqrt{3}} = \frac{2}{5} - \frac{3\sqrt{3}}{15} = \frac{2}{5} - \frac{\sqrt{3}}{5}$$
Ответ: $$\frac{2}{5} - \frac{\sqrt{3}}{5}$$