___ ____ ___ ____ 15*\/ 5 *\/ 28 *a - 7*\/ 7 *\/ 20 *a ------------------------------------ ____ ___ 2*\/ 35 *\/ 4 *a
(((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)
(((15*sqrt(5))*sqrt(28))*(1/4) - (7*sqrt(7))*sqrt(20)*(1/4))/(((2*sqrt(35))*sqrt(4))*(1/4))
(((15*sqrt(5))*sqrt(28))/4 - (7*sqrt(7))*sqrt(20)/4)/(((2*sqrt(35))*sqrt(4))/4)
4
4.00000000000000