1) 1-3/4 2) 6-7/9
3)10-1 1/5
4)2/5+3/7
5)3/8+1/7
6)7/11-1/22
7)13/15-19/45
8)3 11/20+4 19/30
это дроби

Пошаговое объяснение:

1) 1 - 3/4 = 4/4 - 3/4 = 1/4

2) 6 - 7/9 = 54/9 - 7/9 = 47/9 = 5 2/9

3) 10 - 1 1/5 = 9 5/5 - 1 1/5 = 8 4/5

4) 2/5 + 3/7 = 14/35 + 15/35 = 29/35

5) 3/8 + 1/7 = 21/56 + 8/56 = 29/56

6) 7/11 - 1/22 = 14/22 - 1/22 = 13/22

7) 13/15 - 19/45 = 39/45 - 19/45 = 20/45 = 4/9

8) 3 11/20 + 4 19/30 = 3 33/60 + 4 38/60 = 7 71/60 = 8 11/60