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Sagot :

COMEROSSARY
Bonjour,
1) 5x + 9

2) on cherche 5x + 9 = 18
5x = 9
x = 9/5 = 1,8

3) On cherche 5x + 9 = 2x
3x = -9
x = -9/3 = -3
JODEVI

Réponse :

1). x * 5 + 9 = 5x+9

2) 5x+9=18

    5x=18-9

    5x=9

     x = 9/5

     x = 1,8

3) 5x + 9 = 2x

   5x-2x=-9

    3x = -9

     x = -9/3

      x = -3

   

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