Est-ce que vous pouvez me expliquer l exercice svp​

90/60 = (3*30) / (2*30) = 3/2

72/78 = (6*12) / (6*13) = 12/13

96/72 = (4*24) / (3*24) = 4/3

60/96 = (5*12) / (8*12) = 5/8

72/90 = (4*18) / (5*18) = 4/5

60/72 = (5*12) / (6*12) = 5/6

96/78 = (6*16) / (6*13) = 16/13