Ответ:

-49

Пошаговое объяснение:

1) 7 - 12 2/15 = -5 2/15

2) 5 2/15 - 7 = -1 13/15

3) 5 2/15 * (-5 2/15) = 77/15 *(-77/15) = -5929/225

4) 12 2/15 * (-1 13/15) = 182/15 *(-28/15) = -5096/225

5) -5929/225+(-5096/225) = -11025/225 = -49