Ответ:

1) 1/4

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1/10

2) 11/15

- - - -

1/4

3) 3/8

- - - - -

1 1/3

4) 5/9

- - - - -

6 1/3

Пошаговое объяснение:

1) 7/12-1/3 = 7/12-4/12 = 1/4

1/2-2/5 = 5/10-4/10 = 1/10

2) 3/5-4/15 = 15/15-4/15 = 11/15

3/4-1/2 = 3/4-2/4 = 1/4

3) 1/8+1/4 = 1/8+2/8 = 3/8

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

4) 7/18+1/6 = 7/18+3/18 = 10/18 = 5/9

2 1/2+5/6 = 5 1/2+5/6 = 5 3/6+5/6 = 6 2/6 = 6 1/3