Bonsoir,
68 = 2 × 2 × 17
96 = 2 × 2 × 2 × 2 × 2 × 3
180 = 2 × 2 × 3 × 3 × 5
donc : 96/68 = (2 × 2 × 2 × 2 × 2 × 3) / ( 2 × 2 × 17) = (2 × 2 × 2 × 3) / 17 = 24/17
180/96 = (2 × 2 × 3 × 3 × 5) / (2 × 2 × 2 × 2 × 2 × 3) = (3 × 5) / (2 × 2 × 2) = 15/8
je te laisse faire la dernière : 68/180