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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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
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