Bonsoir ,pourriez vous m’aider s’il vous plaît . Je vous remercie d’avance. ( Les / veulent dire sur ) 1) Répondre a des questions du 1er degré a) 5(2x+4)-2x=14-4(1-2x). b) - x/3 + 9/4 = 5/9x +15/2. c) x+2-3/5x-1/3 = - x+1/2-3x+1/3
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A) 5 ( 2 x + 4) - 2 x = 14 - 4 ( 1 - 2 x)10 x + 20 - 2 x = 14 - 4 + 8 x
8 x + 20 = 8 x + 10
8 x - 8 x = 10 - 20
0 x = - 10
x = 0
b ) - x/3 + 9/4 = 5 x /9 + 15/2
- 12 x/36 + 81/36 = 20 x /36 + 270/36
- 12 x - 20 x = 270 - 81
- 32 x = 189
x = - 189/32
c) x + 2 - 3 x /5 - 1/3 = - x + 1/2 - 3 x + 1/3
15 x /15 - 9 x /15 - 5/15 = - 6 x /6 + 3/6 - 18/6 + 2/6
6 x /15 + 6 x/6 = - 16/6 + 5/15
36 x /90 + 30 x /90 = - 240/90 + 30/90
36 x + 30 x = - 240 + 30
66 x = - 210
x = -210/66 = - 35/11