Ответ:

Пошаговое объяснение:

#1.

7/12+1/12=8/12=4/6=2/3

3/9+1/9=4/9

8/17+6/17=14/17

4/10+3/10=7/10

12/25+3/25=15/25=3/4

#2.

9/11-1/11=8/11

3/10-2/10=1/10

8/9-5/9=3/5

11/15-3/15=8/15

12/23-5/23=7/23

#3.

5/14+9/14-3/14=11/14

12/22+1/22+3/22=16/22=8/11

44/54-40/54-1/54=3/54

#4.

(13/29+9/29)-(1/29+2/29)=19/29

1. 22/29

2. 3/29

3. 19/29

(13/44+18/44-4/44)-9/44=18/44=9/22

1.27/44

2. 9/22

20/25-(1/25+9/25+5/25)=1/5

1) 15/25

2) 20/25-15/25=5/25=1/5