Найдите значение выражения (1/3p - 1/7q) : (q/3 - p/7), если p=1/√5 и q=√80.

p = 1/√5, q = √80 = 4√5.

(1/(3√5) - 1/(28√5)) : (4√5/3 - √5/7) = (28-1)/(84√5) : (28√5-3√5)/21 = 27/(84√5) : 25√5/21 = 27/(84√5) * 21/(25√5) = (27*21)/(84*25*5) = (27*1)/(4*25*5) = 27/500.