(1/3 + 1/4) : (2 - 5/6) = 1/2
1) 1/3 + 1/4 = 4/12 + 3/12 = 7/12
2) 2 - 5/6 = 1 6/6 - 5/6 = 1 1/6
3) 7/12 : 1 1/6 = 7/12 : 7/6 = 7/12 * 6/7 = 6/12 = 1/2
Пояснения:
Общий знаменатель 12
12 : 3 = 4 - доп.множ. к 1/3 = (1*4)/(3*4) = 4/12
12 : 4 = 3 - доп.множ. к 1/4 = (1*3)/(4*3) = 3/12
1 целая 1/6 = (1*6+1)/6 = 7/6
6/12 = 1/2 - сократили на 6