Réponse:

Bonjour,

Ex3:

*=signe de multiplication

a. 5y=35

7*5=35 car 35÷5=7

b. 4y= 32

4*8=32 car 32÷4=8

c.-3y=36

-3*(-12)=36 car 36÷(-3)=-12

d.-7y =-63

-7*9=-63 car -63/(-7)=9

Ex 2:

a.x+5=12

x=12-5

x =7

b. x+8=3

x=-8-3

x=-12

c. x-7=5

x=7+5

x=12

d. x-2=-9

x=-9+2

x=-7