Bonjour
Résous les équations suivantes:
a.7/9y+5 =8
7/9y = 8 - 5
7/9y = 3
7y = 27
y = 27/7
b.1/16-2 =5/8 incomplet manque l'inconnue
c.1/4x-3/8 =2/3
1/4x = 2/3 + 3/8
6/24x = 16/24 + 9/24
6x = 25
x = 25/6
d.3/7y-5/35 =8/14
3/7y = 8/14 + 5/35
210/490y = 3 920/490 + 70/490
210y = 3 920 + 70
210y = 3 990
y = 3 990/210
y = 19.
