Сколько будет 2/3+4/5 2,3/8+1,3/4 4/7-3/14 3-1,7/9

2/3 + 4/5 = 10/15 + 12/15 = 22/15 = 1 7/15 2 3/8 + 1 3/4 = 2 3/8 + 1 6/8 = 3 9/8 = 4 1/8 4/7 - 3/14 = 8/14 - 3/14 = 5/14 3 - 1 7/9 = 2 9/9 - 1 7/9 = 1 2/9