Réponse :
voilà la solution de l’exercice
Explications étape par étape :
1. 15x11/3x4 = 3x5x11/3x4 = 5x11/4 =55/4
2. 12x5/4x7 = 2x2x3x5/2x2x7= 3x5/7 =15/7
3. 7x3/12x5 = 7x3/2x2x3x5 = 7/2x2x5 =7/20
4. 5x21/14x20 = 5x3x7/2x7x2x2x5 = 3/2x2x2 = 3/8
5. 17/81 x 9/8 x 7/34 x 64/70 = 17x3x3x7x2x2x2x2x2x2/3x3x3x3x2x2x2x2x17x7x2x5 = 2/3x3x5 =2/45
6. 9x12x10/27x10x6 = 9x12/27x6 = 3x3x3x2x2/ 2x3x3x3x3 = 2/3
7. 3x6x8/16x12x18 = 3x2x3x2x2x2/2x2x2x2x3x2x2x3x3x2 = 1/24
8. 99x25/22x125 = 11x3x3x5x5/11x2x5x5x5 = 3x3/2x5 = 9/10
