Bonsoir,
exercice78
2/5 * 11/9 = 22/45
3/7 * 13/8 = 39/56
5/8 * 17/9 = 85/72
3/2 * 5/7 = 15/14
2/7 * 1/3 = 2/21
15/4 * 1/7 = 15/ 28
Exercice 80
-45/36 * -9/5 = 405/180= 81/36 = 27/12
-7/5 * 50/9 = -350/ 45 =-70/9
16/7 * 21/-12 = 336/-84 = 168/-42 = 84/ - 21= - 28/7
3/4 * 28/5 = 84/20= 42/10 = 21/5
-11/8 *12/33 = -132/ 264 = -66/ 132 = -33/ 66= -11/22 =-1/2
7/2 * 4/(-3) = 28/ -6 = - 14/3
