Ответ:

Пошаговое объяснение:

№4

3/7 - 2. 4/5 + 13/35 =

15/35 - 2. 28/35 + 13/35 =

-2. 13/35 + 13/35 = -2

№5

7. 3/4 : 31/2 = 31/4 * 2/31 = 2/4 = 1/2

№6

5. 1/2 : 11/8 = 11/2 * 8/11 = 8/2 = 4

4. 3/7 - 2 4/5 + 13/35 =15/35+13/35-2 28//35=-2

5. 7  3/4 : 31/2 = 31/4 * 2/31 = 2/4= 1/2

6. 5 1/2 : 11/8 = 11/2 * 8/11 =8/2 = 4