Ответ:

Пошаговое объяснение:

1) (4/11+7/11)×8=11/11×8=1×8=8

2. (1/7+6/7)×5=5

3. (2/5+1/4)×6/13=(8/20+5/20)×6/13=13/20×6/13=3/10

4. (5/8-1/4)×5/6=(5/8-2/8)×5/6=3/8×5/6=15/48

5. 3/5-3/5×2/7=0

(1/8+1/6)×1/7=(3/24+4/24)×1/7=7/24×1/7=1/24