(3/4-1/3) : 5/7 (1/4+2/3) *6/11

7/12,1/2

Пошаговое объяснение:

(3/4-1/3):5/7=(9/12-4/12):5/7=5/12:5/7=7/12

(1/4+2/3)x6/11=(3/12+8/12)x6/11=11/12x6/11=1/2