Bonjour,
Exercice 1 :
a. x + 3 = 18
x = 18 - 3
x = 15
b. 5 + y = -20
x = -20 - 5
x = -25
c. a - 10 = 16
a = 16 + 10
a = 26
d. -5 + t = -24
t = -24 + 5
t = -19
Exercice 2 :
a. 4x = 36
x = [tex]\frac{36}{4}[/tex]
x = 9
b. 3y = -21
y = [tex]-\frac{21}{3}[/tex]
y = -7
c. 18 = -4a
[tex]\frac{18}{4}[/tex] = -a
4,5 = -a
-4,5 = a
d. [tex]\frac{4}{5}[/tex]m = [tex]\frac{2}{3}[/tex]
m = [tex]\frac{2/3}{4/5}[/tex]
m = [tex]\frac{2\times5}{3\times4}[/tex]
m = [tex]\frac{10}{12}[/tex]
m = [tex]\frac{5}{6}[/tex]
En espérant t'avoir aidé :)
