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41 [Ch.2-Rais.2]
Résoudre les équations suivantes.
1.4(x+2)=x+17
2.-3(2x+1)=2x+13
3.5(4x-7)=-5x+15
4.-(2x-10)=11x+49


Répondre :

Bonsoir,

4(x + 2) = x + 17

4x + 8 = x + 17

4x - x = 17 - 8

3x = 9

x = 9/3

x = 3

-3(2x + 1) = 2x + 13

-6x - 3 = 2x + 13

-3 - 13 = 2x + 6x

-16 = 8x

-16/8 = x

-2 = x

5(4x - 7) = -5x + 15

20x - 35 = -5x + 15

20x + 5x = 15 + 35

25x = 50

x = 50/25

x = 2

-(2x - 10) = 11x + 49

-2x + 10 = 11x + 49

10 - 49 = 11x + 2x

-39 = 13x

-39/13 = x

-3 = x

Bonsoir;

1.4(x+2)=x+17

4x +8 = x+17

4x-x = 17-8

3x = 9

x = 9/3

x = 3

2.-3(2x+1)=2x+13

- 6x -3 = 2x+13

-3-13 = 2x+6x

-16 = 8x

x = -16/8

x= -2

3.5(4x-7)=-5x+15

20x -35 = -5x+15

20x +5x = 15 +35

25x = 50

x= 50/25

x= 2

4.-(2x-10)=11x+49

-2x +10 = 11x +49

10-49 = 11x +2x

-39 = 13x

x =-39/13

x = -3