(1/8+2/9-1/4)*5 1/7:(7/9-2/3+1/6) = (9/72+16/72-18/72)*36/7:(14/18-12/18+3/18) = 7/72*36/7:5/18= 1/2*18/5= 9/5= 1 4/5
(10 3/4-12:1 1/5)*4/9+2 1/6+3 1/4:5 1/5= (43/4-12:6/5)*4/9+13/6+13/4:26/5= (43/4-12*5/6)*4/9+13/6+13/4*5/26 = (43/4-10)*4/9+13/6+5/8= (43/4-40/4)*4/9+13/6+5/8 = 3/4*4/9+13/6+5/8= 1/3+13/6+5/8 = 8/24+52/24+15/24= 75/24= 3 3/24 = 3 1/8