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lolood

Ответ:

Пошаговое объяснение:

1)19/28+16/28-17/28=35/28-17/28=18/28=9/14

2)4 11/14 - 2 5/14+ 1 3/14=3 9/14

3)1 - 8/17=17/17-8/17=9/17

4)4 5/9- 2 8/9=3 14/9 - 2 8/9=1 6/9=1 2/3

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