Помогите пожалуйста! (ДАМ 12 БАЛЛОВ)
Выполните действия:

17/12 + 7/20

3/8 + 1/18

1/12 + 11/14

2/15 + 7/12

9/14 - 5/12

19/75 + 7/50

/ = Это дробная черта
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