Прмведите дро к общему занменателю 1/72 и 1/56, 1/48 и 1/72, 2/77 и 3/44, 1/51 и 1/68, 5/36 и 7/54, 9/35 и 11/42, 4/49 и 5/63, 15/98 и 13/72.

1/72 и 1/56 - 7/504 и 72/504
1/48 и 1/72 - 3/144 и 2/144
2/77 и 3/44 - 88/308 и 231/308
1/51 и 1/68 - 4/204 и 3/204
5/36 и 7/54 - 15/108 и 14/108
9/35 и 11/42 - 54/210 и 55/210
4/49 и 5/63 - 36/441 и 35/441
15/98 и 13/72 - 540/3528 и 637/3528