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Пошаговое объяснение:

2/90 + 1/18 = 2/90 + 5/90 = 7/90

8/9 + 5/18 = 16/18 + 5/18 = 21/18 = 7/6 = 1 1/6

3/5 + 2/15 = 9/15 + 2/15 = 11/15

13/18 + 5/24 = 52/72 + 15/72 = 67/72

17/33 + 5/22 = 34/66 + 15/66 = 49/66

5/21 + 3/14 = 10/42 + 9/42 = 19/42

Ответ:

Пошаговое объяснение:

1)

17/35 + 13/28 = 68/140 + 65/140 = 133/140

2)

2/90 + 1/18 = 2/90 + 5/90 = 7/90

3)

8/9 + 5/18 = 16/18 + 5/18 = 21/18 = 7/6 = 1 1/6

4)

3/5 + 2/15 = 9/15 + 2/15 = 11/15

5)

13/18 + 5/24 = 52/72 + 15/72 = 67/72

6)

17/33 + 5/22 = 34/66 + 15/66 = 49/66

7)

5/21 + 3/14 = 10/42 + 9/42 = 19/42