Exercice 12:
a) x+5=-14
x+5-5=14-5
x= ? (je te laisse complèter la fin)
b)17-y=5
17-y-17=5-17
-y/-1=-12/(-1)
y=?
c)5x=-2
5x/5=-2/5
x=?
d)-1/2a=3
-1/2a*(-2/1)=3*(-2/1)
a=?
e)-x/5=2/3
-x/*(-5/1)=2/3*(-5/1)
x=?
f)1/5t-3=1
1/5t-3+3=1+3
1/5t*5/1=4*5/1
t=?
Exercice 13:
a)5a-2=27
5a-2+2=27+2
5a/5=29/5
a=?
b)-7-3x=6
-7-3x+7=6+7
-3x/(-3)=13/(-3)
x=?
c)-25=4x+3
-25-3=4x+3-3
-28/4=4x/4
x=?
d)-2/3b+4=-4
-2/3b+4-4=-4-4
-2/3b*(-3/2)=-8*(-3/2)
b=?
Exercice 14:
a)9/4+x=1
9/4+x-9/4=1-9/4
x=?
b)-1+1/3t=-3/5
-1+1/3t+1=-3/5+1
1/3t*3/1=2/5
t=?
c)9.5=-14-2y
9.5+14=-14-2y+14
23.5/(-2)=-2y/(-2)
y=?
d)-4x-1/3=8/3
-4x-1/3+1/3=8/3+1/3
-4x/(-4)=9/3:(-4)
x=?