Réponse:
Bonjour
a. On distribue, on reduit et on isole x
4(2-x)+5 = -3(2x+3)-12
8-4x+5=-6x-9-12
13-4x = -6x-21
-4x+6x = -21-13
2x = -34
x = - 17
b.
15x+5 = 20x-8
5+8 = 20x-15x
13 = 5x
x = 13/5
c.
2x+5=3-6x
2x+6x = 3-5
8x = -2
x = -2/8
x = -¼
d.
x-(x+1) = (x+3)-(x-3)
x-x-1 = x+3-x+3
-1 = 6
L'equation n'a pas de solution
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Réponse:
Bonjour
a. On distribue, on reduit et on isole x
4(2-x)+5 = -3(2x+3)-12
8-4x+5=-6x-9-12
13-4x = -6x-21
-4x+6x = -21-13
2x = -34
x = - 17
b.
15x+5 = 20x-8
5+8 = 20x-15x
13 = 5x
x = 13/5
c.
2x+5=3-6x
2x+6x = 3-5
8x = -2
x = -2/8
x = -¼
d.
x-(x+1) = (x+3)-(x-3)
x-x-1 = x+3-x+3
-1 = 6
L'equation n'a pas de solution