Bonjour pouvez-vous m’aider s’il vous plaît pour ces 3 exercices

Réponse :

Bonjour,

1. a)

4/7 :

-4/7 + 8 = 52/7 # -5*4/7 donc non

5:

-5 + 8 = 3 # -5*5 donc non

4/7:

-2+8 = 6 # -5*2 donc non

b) 4*16/49 + 16*4/7 = 64 + 448  / 7 =512/7

6 ( 86 / 7) = 516 / 7 # 512 / 7

Exercice 2.

a) 7x - 10x + 35

-3x = -35

3x = 35

x = 35/3

b) -x - 11 = 22

-x = 33

x = -33

c) -150 - 10x = 9x

-19x = 150

x = -150/19

d) -15x + 15 + 7x = 4

-8x = -11

8x = 11

x = 11/8

e) 7 - (6x + 2 )= 4x - 4

7 - 6x - 2 = 4x - 4

-6x - 4x = -4 + 2 -7

-10x = -9

10x = 9

x = 9/10

f) -3+7x = -10x + 2

17x = 5

x = 5/17

Exercice 3

1)

-5.

-5 + 7 = 2

2* (-6) = -12.

2)

x.

x+ 7

(x+7) * (-6) = -6x - 42

3. On cherche -6x - 42 = 8

-6x = 8+ 42

-6x = 50

x = 50/ -6

Bon courage