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
