Bonjour,
Exercice 30
a) x= 5+2 = 7
c) 3x= 36
x= 36/3
x= 12
e) x= 15/6 = 5/2
b) 5x=-24
x= -24/5
d) x= 16-9 = 7
f) 7x= 49
x= 49/7 = 7
exercice 31
a) x = 3-11 = -8
c) x= 13,4 - 23 = -9,6
b) x= -6 +4= -2
d) x= -76 -6 = -82
Exercice 32
a) x= 88,44/11 =8,04
c) x = 15*3 = 45
e) x= 15,3/6 = 2,55
b) x = 714/7 =102
d) x= 270 *10 = 2 700
f) 12x = 120
x= 120/12 = 10