Bonjour, j'aurais besoin d'aide pour ces équations qui se trouvent dans mon dm de 3e. Merci avance ! 3a - 11 = -5a + 4 5 + 3x = 7(3 - 2x) 2(x + 8) + 3 = 4 - 3x

bonjour

3 a - 11 = - 5 a + 4

3 a + 5 a = 4 + 11

8 a =  15

a =  15/8

5 + 3 x = 21 - 14 x

3 x +14 x = 21 - 5

17 x =  16

x = 16/17

2 x + 16 + 3 = 4 - 3 x

2 x +  3 x = 4 - 16 - 3

5 x =  - 15

x = - 3

2 x /5 - 1 /10 = 1 /2

4 x /10 - 1 /10 =  5 /10

4 x = 5 + 1

4 x = 6

x = 6/4 = 3 /2

Bonjour,

3a - 11 = -5a + 4

3a+5a = 4+11

8a =15

a = 15/8

5 + 3x = 7(3 - 2x)

5+3x = 21 -14x

3x+14x = 21-5

17x = 16

x=16/17

2(x + 8) + 3 = 4 - 3x

2x +17 +3 = 4-3x

2x+5x =4-17-3

7x = -16

x = -16/7

2x/5 - 1/10 = 1/2 ​

4x/10 - 1/10 = 5/10

4x/10 = 5/10 +1/10

4x/10 = 6/10

2x/5 = 3/5

2x = (3/5)*5 = 15/5 = 3

2x=3

x= 3/2