2целых 1/3*6/7-(1целая11/12-1/3):4целых3/4

=( 7/3)*(6/7)- (23/12 - 1/3)÷(19/4) = 2- ((23-4)/12)÷(19/4) = 2- (21/12)÷(19/4)== 2- 21*4/(12*19) = 2 - 21/57 = (114-21)/57= 93/57=31/19= 1 12/19