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Sagot :

Bonjour,

1 post = 1 exercice

Ex. 9 :

a) x - 6 = 10

⇒ x - 6 + 6 = 10 + 6

⇒ x = 16

b) x + 7 = 2

⇒ x + 7 - 7 = 2 - 7

⇒ x = -5

c) 4x + 5 = 3

⇒ 4x + 5 - 5 = 3 - 5

⇒ 4x = -2

⇒ 4x ÷ 4 = -2 ÷ 4

⇒ x = -0,5

Bonsoir,

exercice 9

x= 10+6

x= 16

x=  2-7

x= -5

4x = 3-5

4x = -2

x= -2/4 = -1/2 = -0,5

3x= 5+5

3x = 10

x= 10/3

Exercice 10

8x-3x =22-7

5x= 15

x= 15/5

x= 3

9x-2x =17 +4

7x= 21

x=21/7  

x= 3

Donc vrai

Exercice 5

A:

x

x+10

5(x+10) = 5x+50

5x+50 + x = 6x+50

B

x

3x

3x-8

3x-8 - 5x = -2x -8

6x+50 =  -2x -8

6x+2x = -8 -50

8x = -58

x =-58/8  = -7,25

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