15) $$\frac{10b-8a-1}{3x^2} = \frac{10b}{3x^2} - \frac{8a}{3x^2} - \frac{1}{3x^2}$$
Ответ: $$\frac{10b}{3x^2} - \frac{8a}{3x^2} - \frac{1}{3x^2}$$