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Sagot :

ILONA200722

Réponse:

Voici le résultat du 3 et 4

View image ILONA200722

Bonjour,

1)

-7 -2 = 7x -4x

- 9 =3x

x= -9/3 = -3

2)

2x-16 = 4x-5

-16+5 = 4x-2x

-11 = 2x

 -11/2 =-5,5

3)

3x +5x -20 = 0

3x+5x = 20

8x = 20

x= 20/8 = 10/4 = 5/2 = 2,5

4)

5x-45 +2x  = 4-x

5x+2x +x = 4+45

8x = 49

x = 49/8

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