bonjour quelqu'un pourrait m aider merci d avance :)

Bonsoir,
A= 5/6 * 7/2
= 35/12
B= 11/9 *3/22
= 33/ 198 = 3/18
C= 40/ 15 *9/8
= 360/120 = 36/12 = 3
D= 7/3 - 4/3 * 5/12
= 7/3 -20/36
= 84/36 - 20/36
= 64/36 = 32/18 = 16/9
E= (10/10 - 3/10 )/ (15/30)
7/10 / 1/15
= 7/10 *15
= 105/10 = 21/2