Resoudre les équations suivantes: (E1):3x-1=-13 (E5):11x-3=2x+9 (E2):-2x+5=8 (E6):x/7=-7/4 (E3):5x=0
Mathématiques
lydia213
Question
Resoudre les équations suivantes:
(E1):3x-1=-13 (E5):11x-3=2x+9
(E2):-2x+5=8 (E6):x/7=-7/4
(E3):5x=0 (E7):(-2x-5)(3x+2)=0
(E4):4-x=7 (E8):x²=50
(E1):3x-1=-13 (E5):11x-3=2x+9
(E2):-2x+5=8 (E6):x/7=-7/4
(E3):5x=0 (E7):(-2x-5)(3x+2)=0
(E4):4-x=7 (E8):x²=50
1 Réponse
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1. Réponse pan59
3x-1 = -13
3x = -13+1
3x = -12
x = -4
-2x+5=8
-2x+5-8=0
-2x-3=0
-2x=3
x = -1,5
5x=0
x=0
4-x = 7
4-7 = x
x=-3
11x-3 = 2x+9
11x-2x = 9+3
9x = 12
3x = 4
x = 4/3
x/7 = (-7/4)
x = 7 (-7/4)
x = -49/4
(-2x-5)(3x+2) = 0
-2x-5=0: x = - 2,5
3x+2=0: 3x = -2: x = -2/3
x² = 50
x = + racine(50) ou - racine(50)