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Résous les équations suivantes :
a) 5x - 2 = -7
b) 3x + 2 = x + 6
c) - 8x + 3 = 5x - 2
d) 3x +5=7-2x

C’est pour demain merci de m’aider

Sagot :

VINS

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[tex]5 x - 2 = - 7\\5 x = - 7 + 2 \\5 x = - 5 \\x = - 1\\\\3 x + 2 = x + 6 \\3 x - x = 6 - 2 \\2 x = 4\\x = 2 \\\\- 8 x + 3 = 5 x - 2 \\- 8 x - 5 x = - 2 - 3 \\- 13 x = - 5 \\x = 5/13 \\\\\\3 x + 5 = 7 - 2 x \\3 x + 2 x = 7 - 5 \\5 x = 5 \\x = 1 \\\\[/tex]

Réponse:

a) 5x = -7+2

5x = -5

x = -5/5

x = -1

b) 3x -x = 6-2

2x = 4

x = 4/2

x = 2

c) -8x -5x = -2-3

-13x = -5

x = -5/-13

x = 5/13

d) 3x + 2x = 7-5

5x = 2

x = 2/5

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