Помогите ато я очень очень хочу дремать

1) 4/7 + 2/5= 20/35+ 14/35 = 34/35

7/12- 5/9=21/36- 20/36 = 1/36

9/16- 3/8 = 9/16 - 6/16 = 3/16

3 4/9 - 2 1/6 = 3 8/18 - 2 3/18 = 1 5/18

2 3/4 + 3 2/5 = 2 15/20 + 3 8/20 = 5 23/20 = 6 3/20

5 -3 14/17 = 4 17/17 - 3 14/17 = 1 3/17

2) 4/27 * 9/16 = 1/3 * 1/4 = 1/12
5 3/5 * 1 4/21 = 28/5 * 25/21 = 4/1 * 5/3= 20/3 =6 2/3
3 4/15 * 1 17/28 = 49/15 * 45/28 = 7/1 * 3/4 = 21/4=5 1/4
13/24 * 32 = 13/3 * 4= 52/3 = 17 1/3

3)12/35 * 5/2 = 6/7* 1/1 = 6/7
8 3/4 : 2 1/3 = 35/4 * 3/7 = 5/4* 3/1 = 15/4= 3 3/4
15/17* 1/5 = 3/17
32 * 3/16 = 2*3/1= 6