Сократим дроби:
35/42 = (5*7) / (6*7) = 5/6
13/78 = 13 / (6*13) = 1/6
75/100 = (3*25) / (4*25) = 3/4
Ответ: 35/42 = 5/6; 13/78 = 1/6; 75/100 = 3/4