Помогите как решить дроби

25/28-2/21 | 41/54-35/72 | 20/21-3/14 | 40 /143+39/110 | 43/140+41/150 | 73/80-37/100

Ответ:

Пошаговое объяснение:

25/28-2/21 = 75/84 - 8/84 = 67/84

41/54-35/72 = 164/216 - 105/216 = 59/216

20/21-3/14 =40/42 - 9/42 = 31/42

40/143+39/110 = 400/1430 + 507/1430 = 907/1430

43/140+41/150 = 645/2100 + 574/2100 = 1219/2100

73/80-37/100 = 365/400 - 148/400 = 217/400