Answered

Bonjour vous pouvez m'aider s'il vous plaît :
Résoudre les équations suivantes
a. x + 6 = 0 b. 3x = 5 c. 2x + 1 = 0
d. -5x - 2 = 1 e. 6/5 x + 1 = 0 f. 3/2 x + 3/4 = 1 g. ( x + 1 ) ( x -6 ) =0 h. ( 3x + 1 ) ( 2x - 1 ) = 0 i. 2x = 4x + 2 j. 3x + 5 = 2x - 1

Sagot :

Bonjour,

a. x + 6 = 0

x= -6

b. 3x = 5

x= 5/3

c. 2x + 1 = 0

2x= -1

x= -1/2 = -0,5

d. -5x - 2 = 1

-2-1 = 5x

-3 = 5x

-3/5

e. 6/5 x + 1 = 0

6x/5 = -1

6x = -1*5

6x = -5

x= -5/6

f. 3/2 x + 3/4 = 1

3x/2 = 1-3/4

3x/2 = 4/4 - 3/4

3x/2 = 1/4

3x= 1/4 *2

3x = 2/4 = 1/2

x= (1/2)/3

x= 1/2 *1/3

x = 1/6

g. ( x + 1 ) ( x -6 ) =0

soit

x+1= 0

=> x= -1

soit

x-6= 0

=> x= 6

h. ( 3x + 1 ) ( 2x - 1 ) = 0

3x+1 =0

3x = -1

x= -1/3

ou

2x-1 = 0

2x = 1

x= 1/2

i. 2x = 4x + 2

-2 = 4x -2x

-2 = 2x

x= -2/2

x= -1

j. 3x + 5 = 2x - 1

3x-2x = -1-5

x = -6