Réponse:
Bonjour
a) 7x-5 = 12x+20
7x-12x = 20+5
-5x = 25
x = -25/5
x = -5
b) 3/4x - 2/5 = 6/5 + 9/4x
3/4x - 9/4x = 6/5 + 2/5
-6/4x = 8/5
-3/2x = 8/5
x = - 8/5 × 2/3
x = - 16/15
c) 4x-8/5 = 2x+3/6
6(4x-8) = 5(2x+3)
24x-48 = 10x + 15
24x-10x = 15+48
14x = 63
x = 63/14
x = 9/2
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Réponse:
Bonjour
a) 7x-5 = 12x+20
7x-12x = 20+5
-5x = 25
x = -25/5
x = -5
b) 3/4x - 2/5 = 6/5 + 9/4x
3/4x - 9/4x = 6/5 + 2/5
-6/4x = 8/5
-3/2x = 8/5
x = - 8/5 × 2/3
x = - 16/15
c) 4x-8/5 = 2x+3/6
6(4x-8) = 5(2x+3)
24x-48 = 10x + 15
24x-10x = 15+48
14x = 63
x = 63/14
x = 9/2