J' arrive pas ces exercices : a ) -5x - 3 =12 b) 13 = - x+4 c) - 4 =3x +1 d) -2 - 9x = 11 Sa serait gentil de m' aider :)
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J' arrive pas ces exercices : a ) -5x - 3 =12 b) 13 = - x+4 c) - 4 =3x +1 d) -2 - 9x = 11 Sa serait gentil de m' aider :)
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a -5x-3=12
-5x=15
x=15/-5=-3
b -x+4=13
-x=9
x=-9
c 3x+1=-4
3x=-5
x=-5/3
d -2-9x=11
-9x=13
x=-13/9
a.
-5x-3=12
-5x-3+3=12+3
-5x=15
x=15/-5
x=-3
b .
13=-x+4
13-4=-x+4-4
9=-x
x=9/-1
x=-9
c.
-4=3x+1
-4-1=3x+1-1
-5=3x
x=-5/3
d.
-2-9x=11
-2-9x+2=11+2
-9x=13
x=13/-9
voilà..... :)