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Bonjour

1) 15 + x = 22

x = 22 - 15

x = 7

2) x /- 5 = 7

- x/5 = 35/5

- x= 35

x = - 35

3) 45 = - 9 + x

x = 9 + 45

x = 54

4) - 4x - 1 = - 3

- 4x = - 3 + 1

- 4x = - 2

x = 2/4

x = 1/2

5) 7x = - 3x + 8

7x + 3x = 8

10x = 8

x = 8/10

x = 4/5

6) 1,5x + 3,2 = 2,5x + 2,8

1,5x - 2,5x = 2,8 - 3,2

- x = - 0,4

x = 0,4.

7) 3 - (x - 1) = 3x - 4

3 - x + 1 = 3x - 4

- x - 3x = - 4 - 3 - 1

- 4x = - 8

x = 8/4

x = 2

8) 5 + 2 (x - 3) = 7 - (2x - 8)

5 + 2x - 6 = 7 - 2x + 8

2x + 2x = 7 + 8 - 5 + 6

4x = 16

x = 16/4

x = 4

9) 3 - 4 (2x - 1) = 3 + (3x - 2)

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

- 8x - 3x = 3 - 2 - 3 - 4

- 11x = - 6

x = 6/11

10) 3x/5 - 1/15 = 2 - x/3

5x/15 - 1/15 = 30/15 - 5x/15

5x/15 + 5x/15 = 30/15 + 1/15

5x + 5x = 30 + 1

10x = 31

x = 31/10

x = 3,1.

Bonjour,

Résoudre les équations:

• 15+x= 22

x= 22-15

x= 7   S= {7}

• x= -5(7)

x= -35   S= {-35}

• -4x-1= -3

-4x= -3+1

x= -2/4

x= -1/2   S= { -1/2 }

• 7x+3x= 8

10x= 8

x= 8/10

x= 4/5   S ={ 4/5 }

• 1.5x-2.5x= 2.8-3.2

-x= -0.4

x= 0.4    S= { 0.4 }

• 3-x+1= 3x-4

-x-3x= -4-1-3

-4x= -8

x= -8/-4

x= 2    S= { 2 }

• 5+2x-6= 7-2x+8

2x-1= -2x+15

2x+2x= 15-1

4x= 14

x= 14/4   S= { 14/4 }

• 3-8x+4= 3+3x-2

-8x+12= 3x+1

-8x-3x= 1-12

-11x= -11

x= -11/-11

x= 1   S={ 1 }

• 3x/5+x/3= 2+1/15

(3*3x+5*x)/ 15= (2*15+1)/ 15                      

14 x= 31

x= 31/14   S= { 31/14 }