№459

1) 3/5 и 5/6 = 18/30 и 25/30

2) 6/11 и 4/11 = 56/99 и 44/99

3) 5/6 и 4/11 = 55/66 и 24/66

4) 7/18 и 1/6 = 7/18 и 3/18

5) 9/13 и 4/5 = 45/65 и 52/65

6) 5/7 и 3/4 = 20/28 и 21/28

7) 2/15 и 1/3 = 2/15 и 5/15

8) 5/8 и 3/4 = 5/8 и 6/8

№461

1) 7/20 и 5/12 = 21/60 и 25/60

2) 11/24 и 1/30 = 55/120 и 4/120

3) 3/16 и 7/12 = 9/48 и 28/ 48

4) 11/18 и 7/12 = 22/36 и 21 /36

5) 1/12 и 2/9 = 3/36 и 8/36

6) 4/21 и 13/28 = 16/84 и 39/84

7) 8/15 и 5/12 = 32/60 и 25/60

8) 7/30 и 1/12 = 14/60 и 5/60