UNKO
Answered

Bonjour,Exercice 3 : Résoudre les équations suivantes :
a) 3 x=2 x+5 b) 4−5 x=9 x
c) 4 x+2=x+11 d) 3 x−7=−2 x−9
e) 5 x−1=7 x−1 f) 3 x−2+x=6+4 x

Sagot :

SKABETIX

Bonjour,

a) 3x = 2x + 5

3x - 2x = 5

x = 5

b) 4 - 5x = 9x

4 = 9x + 5x

4 = 14x

x = 14/4 = 7/2 = 3,5

c) 4x + 2 = x + 11

4x - x = 11 - 2

3x = 9

x = 9/3 = 3

d) 3x - 7 = - 2x - 9

3x + 2x = - 9 + 7

5x = - 2

x = -2/5

e) 5x - 1 = 7x - 1

7x - 5x = 1 - 1

x = 0

f) 3x - 2 + x = 6 + 4x

4x - 2 = 4x + 6

- 2 # 6 => Impossible