Ответ:

Пошаговое объяснение:

1) = -(3/4 + 3 1/4) = -3 4/4 = - 4

2) = -(11 3/4 + 5 3/4) = -16 6/4 = -17 1/2

3) = -(7/8 + 1/4) = -(7/8 + 2/8) = -9/8 = -1 1/8

4) = -(9/11 + 4 3/11) = -4 12/11 = -5 1/11

5) = -(3/17 + 11/34) = -(6/34 + 11/34) = -17/34 = -1/2

6) = -(7/12 + 8 1/6) = -(7/12 + 8 2/12) = -8 9/12 = -8 3/4