Verified answer

Пошаговое объяснение:

7) 11/48 - 5/36 = 3*11-4*5/144 = 13/144

8) 4/5-2/3+4/15 = 3*4-5*2/15 = 2/15 = 2+4/15 = 6/15 = 2*3/5*3 = 2/5

9) 7/8 + 11/12 - 5/6 = 3*7+2*11/24 = 43/24 = 1 19/24-5/6 = 43/24 - 5/6 = 43-4*5/24 = 23/24