Bonjour. Est ce que vous pourriez m'aider ? il faut donner la valeur des lettres : a) 2x (lettre) - 2 = 2 b) 3z-10 = 11 c) 1-y = 0 d) 1+5x (lettre) = 39 e) 2+3z

Réponse :

Explications étape par étape

Bonsoir

a) 2x (lettre) - 2 = 2

2x = 2 + 2

x = 4/2

x = 2

b) 3z-10 = 11

3z = 11 + 10

z = 21/3

z = 7

c) 1-y = 0

y = 1

d) 1+5x (lettre) = 39

5x = 39 - 1

x = 38/5

x = 7,6

e) 2+3z = 9

3z = 9 - 2

z = 7/3

f) 6-y=-2.3

y = 6 + 2,3

y = 8,3

g) 7-3x (lettre)= -22

3x = 7 + 22

x = 29/3

h) 5+6z = -11

6z = -11 - 5

z = -16/6

z = (-2 x 8)/(2 x 3)

z = -8/3

i) -x (lettre) -9 = 11.2

x = -9 - 11,2

x = -20,2

j) 9.7y - 5.7 = -1.7

9,7y = 5,7 - 1,7

y = 4/9,7

y = 40/97

bonjour

2 x - 2 = 2

2 x = 2 + 2

2 x = 4

x = 2

3 z - 10 = 11

3 z = 11 + 10

3 z = 21

z = 7

1 - y = 0

- y = - 1

y = 1

1 + 5 x  = 39

5 x = 39 - 1

5 x = 38

x = 38/5

2 + 3 z = 9

3 z = 9 - 2

3 z =  7

z =  7/ 3

6 - y = - 2.3

- y = - 2.3 + 6

- y =  3.7

y = - 3.7

7 - 3 x = - 22

- 3 x = - 22 - 7

- 3 x = - 29

x = 29/3

5 + 6 z = - 11

6 z = - 11 - 5

6 z =  - 16

z =  - 16/6  = - 8 /3

- x - 9 =  11 .2

- x = 11.2 + 9

- x =  20 .2

x = - 20.2

9.7 y - 5 .7 = - 1 .7

9.7 y = - 1.7 + 5.7

9.7 y =  4

y =  4 /9.7  = 40/97