Приведите дроби к общему знаменателю: 2/15 и 5/12, 5/12 и 7/8, 6/15 и 11/18, 5/16 и 5/12, 7/33 и 3 / 77, 2/55 и 5/22, 4/15 и 3/20, 5/121 и 8/99, 1/72 и 1/56, 1/48 и 1/72, 2/77 и 3/44, 1/51 и 1/68

1) 2/15 и 5/12 = 8/60 и 25/60;

2) 5/12 и 7/8 = 10/24 и 21/24;

3) 6/15 и 11/18 = 36/90 и 55/90;

4) 5/16 и 5/12 = 15/48 и 20/48;

5) 7/33 и 3/77 = 49/231 и 9/231;

6) 2/55 и 5/22 = 4/110 и 25/110;

7) 4/15 и 3/20 = 16/60 и 9/60;

8) 5/121 и 8/99 = 45/1089 и 88/1089;

9) 1/72 и 1/56 = 7/504 и 9/504;

10) 1/48 и 1/72 = 3/144 и 2/144;

11) 2/77 и 3/44 = 8/308 и 21/308;

12) 1/51 и 1/68 = 4/204 и 3/204.