bonjour, pouvez vous m'aider à résoudre ces équations de maths svp ? je n'y arrive pas. Merci d'avance ! a. 3x+ 7 = 25 b. -2x+ 5x= 36 c. 14 = 5x–9 d. 6x–

[tex]bonjour\\\\\\3 x + 7 = 25 \\3 x = 25 - 7\\3 x = 18\\x = 6\\\\\\- 2 x + 5 x = 36\\3 x = 36\\\x = 12 \\\\\\\\14 = 5 x - 9\\\- 5 x = - 9 - 14\\- 5 x = - 23\\x = 23/5\\\\6 x - 4 = 3 x + 14 \\6 x - 3 x = 14 + 4\\3 x = 18\\x = 6 \\\\[/tex]

continue, tu as pas mal d'exemples

Bonjour,

Résoudre ces équations

a. 3x+ 7 = 25

3x + 7 - 7 = 25 - 7

3x = 18

3x/3 = 18/3

x = 6

b. -2x + 5x = 36

3x = 36

3x/3 = 36/3

x = 12

c. 14 = 5x–9

14 + 9 = 5x - 9 + 9

23 = 5x

5x = 23

5x/5 = 23/5

x = 23/5

d. 6x–4 = 3x+ 14

6x - 4 - 3x = 3x + 14 - 3x

3x - 4 = 14

3x - 4 + 4 = 14 + 4

3x = 18

3x/3 = 18/3

x = 6

e. 3x+ 5 = 5x+ 7

3x + 5 - 3x = 5x + 7 - 3x

5 = 2x + 7

5 - 7 = 2x + 7 - 7

-2 = 2x

2x = -2

2x/2 = -2/2

x = -1

f. 9 –2x= 11 + 4x

9 - 2x + 2x = 11 + 4x + 2x

9 = 11 + 6x

9 - 11 = 11 + 6x - 11

-2 = 6x

6x = -2

6x/6 = -2/6

x = -2/6

g. 3(x+ 5) = 32

3 × x + 3 × 5 = 32

3x + 15 = 32

3x + 15 - 15 = 32 - 15

3x = 17

3x/3 = 17/3

x = 17/3

h. 14 = 5(x–4)

14 = 5 × x + 5 × (-4)

14 = 5x - 20

14 + 20 = 5x - 20 + 20

34 = 5x

5x = 34

5x/5 = 34/5

x = 34/5

i. 7(x–2) + 3x–5 = -7

7 × x + 7 × (–2) + 3x - 5 = -7

7x - 14 + 3x - 5 = -7

10x - 19 = -7

10x - 19 + 19 = -7 + 19

10x = 12

10x/10 = 12/10

x = 12/10

j. 2(1 –2x) = 9 + 3x

2 × 1 + 2 × (–2x) = 9 + 3x

2 - 4x = 9 + 3x

2 - 4x - 3x = 9 + 3x - 3x

2 - 7x = 9

2 - 7x - 2 = 9 - 2

-7x = 7

-7x/-7 = 7/-7

x = -1

k. 10(x+ 4) + 7(2x–3) = 7

10 × x + 10 × 4 + 7 × 2x + 7 × (-3) = 7

10x + 40 + 14x - 21 = 7

24x + 19 = 7

24x + 19 - 19 = 7 - 19

24x = -12

24x/24 = -12/24

x = -12/24