Ответ:

1/15 - 1/30 = 2/30 - 1/30 = 1/30

3/10 - 2/15 = 9/30 - 4/30 = 5/30 = 1/6

1/6+8/9 = 3/18 + 16/18 = 1 1/18

3/5 + 0,4 = 0,6 + 0,4 = 1

23/45 + 13/30 = 46/90 + 39/90 = 85/90 = 17/18

1/4 + 0,5 = 0,25 + 0,5 = 0,30 = 0,3 или 3/10

3/4 + 1/6 = 9/12 + 2/12 = 10/12 = 5/6

13/14 - 5/42 = 39/42 - 5/42 = 34/42 = 17/21

1/8 - 1/16 = 2/16 - 1/16 = 1/16

7/12 + 11/18 = 21/36 + 22/36 = 42/36 = 1 6/36 = 1 1/6