Réponse :
Explications étape par étape
Bjr,
1)
13b-8b = -7 -3
5b = -10
b= -10/5 = -2
2)
-20 = 26a -16a
-20 = 10a
a = -20/10 = -2
3)
5,5x -4x = 8
1,5x = 8
x = 8/1,5
non!
4)
12,5y -3y = -4 -15
9,5y = -19
y = -19/9,5 = -2
5)
3x² -6x = 24
3(x² -2x) =24
x² -2x = 24/3
non
6)
7t/2 - t/4 =3+1
14t/4 -t/4 = 4
13t/4 = 4
13t = 4*4 = 16
t = 16/3
non
