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errevaeelleboode
@errevaeelleboode
January 2023
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Bonjour, je comprend vraiment rien au scratchs svp aidait moi
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1. Lutin 1 :
(7 + 5)*2 = 24
24 - 7 = 17
Lutin 2 :
(7*7) - 8 = 41
2. (-4*7)-8 = -20
Il affiche -20.
3. a. Étape 3 : x + 5
Étape 4 : (x + 5)*2
Étape 5 : 2(x + 5) - x
b. 2(x + 5) - x = 2x + 10 - x = x + 10
4. Les instructions 3 et 4.
5. Lutin 1 = Lutin 2
x + 10 = 7x - 8
x + 10 - 10 = 7x - 8 - 10
x = 7x - 18
x - 7x = 7x - 7x - 18
-6x = - 18
-6x/-6 = -18/-6
x = 3
Ce nombre est donc x, on peut vérifier.
x + 10 soit 3 + 10 = 13
7x - 8 soit 7*3 - 8
21 - 8 = 13
13 = 13
Donc c’est bien ça.
(N’hésite pas à mettre en meilleure réponse ! ;) )
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errevaeelleboode
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Verified answer
1. Lutin 1 :(7 + 5)*2 = 24
24 - 7 = 17
Lutin 2 :
(7*7) - 8 = 41
2. (-4*7)-8 = -20
Il affiche -20.
3. a. Étape 3 : x + 5
Étape 4 : (x + 5)*2
Étape 5 : 2(x + 5) - x
b. 2(x + 5) - x = 2x + 10 - x = x + 10
4. Les instructions 3 et 4.
5. Lutin 1 = Lutin 2
x + 10 = 7x - 8
x + 10 - 10 = 7x - 8 - 10
x = 7x - 18
x - 7x = 7x - 7x - 18
-6x = - 18
-6x/-6 = -18/-6
x = 3
Ce nombre est donc x, on peut vérifier.
x + 10 soit 3 + 10 = 13
7x - 8 soit 7*3 - 8
21 - 8 = 13
13 = 13
Donc c’est bien ça.
(N’hésite pas à mettre en meilleure réponse ! ;) )