МагистрЭН (2/3:4/9)в квадрате = (2/3 * 9/4)^2 = (3/2)^2 = 9/4 = 2 1/4

(2/3)в кв:(4/9)в кв = 4/9 : 16/81 = 4/9 * 81/16 = 9/4 = 2 1/4

(2/7•5/12:5/14)в кв = (2/7 * 5/12 * 14/5)^2 = (2/6)^2 = (1/3)^2 = 1/9