Подстановка условия
[src](8*((3*a)/2 - 9/4))/3 + (6*((5*a)/2 - 5/6))/5 при a = 3/2
(8*((3*a)/2 - 9/4))/3 + (6*((5*a)/2 - 5/6))/5
$$\frac{8}{3} \left(\frac{3 a}{2} - \frac{9}{4}\right) + \frac{6}{5} \left(\frac{5 a}{2} - \frac{5}{6}\right)$$
(8*((3*(3/2))/2 - 9/4))/3 + (6*((5*(3/2))/2 - 5/6))/5
$$\frac{8}{3} \left(\frac{3 (3/2)}{2} - \frac{9}{4}\right) + \frac{6}{5} \left(\frac{5 (3/2)}{2} - \frac{5}{6}\right)$$
(8*((3*3/2)/2 - 9/4))/3 + (6*((5*3/2)/2 - 5/6))/5
$$\frac{8}{3} \left(- \frac{9}{4} + \frac{\frac{9}{2}}{2} 1\right) + \frac{6}{5} \left(- \frac{5}{6} + \frac{\frac{15}{2}}{2} 1\right)$$