2 3/4 : (1 1/2 - 2/5) + (3/4 + 5/6) : 3 1/6 = 3
1) 1 1/2 - 2/5 = 3/2 - 2/5 = 15/10 - 4/10 = 11/10 = 1 1/10 = 1,1
2) 2 3/4 = 2,75 в десятичных дробях 2,75 : 1,1 = 2,5
3) 3/4 + 5/6 = 9/12 + 10/12 = 19/12 = 1 7/12
4) 1 7/12 : 3 1/6 = 19/12 : 19/6 = 19/12 * 6/19 = 6/12 = 1/2 = 0,5
5) 2,5 + 0,5 = 3