Подстановка условия
[src](((15*sqrt(5))*sqrt(28))*a - (7*sqrt(7))*sqrt(20)*a)/(((2*sqrt(35))*sqrt(4))*a) при a = 1/4
(((15*sqrt(5))*sqrt(28))*a - (7*sqrt(7))*sqrt(20)*a)/(((2*sqrt(35))*sqrt(4))*a)
$$\frac{1}{a 2 \sqrt{35} \sqrt{4}} \left(- 14 \sqrt{35} a + a \sqrt{28} \cdot 15 \sqrt{5}\right)$$
(((15*sqrt(5))*sqrt(28))*(1/4) - (7*sqrt(7))*sqrt(20)*(1/4))/(((2*sqrt(35))*sqrt(4))*(1/4))
$$\frac{1}{(1/4) 2 \sqrt{35} \sqrt{4}} \left(- 14 \sqrt{35} (1/4) + (1/4) \sqrt{28} \cdot 15 \sqrt{5}\right)$$
(((15*sqrt(5))*sqrt(28))/4 - (7*sqrt(7))*sqrt(20)/4)/(((2*sqrt(35))*sqrt(4))/4)
$$\frac{- \frac{7 \sqrt{35}}{2} + \frac{30 \sqrt{35}}{4} 1}{\frac{1}{4} \cdot 2 \sqrt{35} \sqrt{4}}$$