Пошаговое объяснение:

а)

(3/4+2)/(1-3/4) = (2 3/4)/(1/4) = 2 3/4 : 1/4 = 11/4 * 4/1 = 44/4 = 11

б)

(7/3-2)/(1+7/3) = (2 1/3-2)/(1+2 1/3)= (1/3)/(3 1/3) =

1/3 : 3 1/3 = 1/3 : 10/3 = 1/3 * 3/10 = 1/1 * 1/10 = 1/10

в)

(1+3/2)/(3/2-1) = (1+1 1/2)/(1 1/2-1) = (2 1/2)/(1/2) =

2 1/2 : 1/2 = 5/2 * 2/1 = 5/1 * 1/1 = 5/1 = 5