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caro62147
@caro62147
June 2021
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Voici un programme de calcul : Choisir un nombre. Soustraire 7. Ajouter - 8. Multiplier le résultat par - 5. Retrancher 75. 1) Appliquer ce programme au nombre 2, puis au nombre - 3. 2) Quel nombre faut-il choisir au départ pour obtenir - 750 ?
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droopette
(x-7+(-8))*(-5)-75
pour x=2
(2-7+(-8))*(-5)-75
=(2-7-8)*(-5)-75
=-13*(-5)-75
=85-75
=10
pour x=-3.2
(-3.2-7+(-8))*(-5)-75
=(-10.2-8)*(-5)-75
=-18.2*(-5)-75
=91-75
=16
Pour obtenir -750:
(x-7+(-8))*(-5)-75=-750
(x-15)*(-5)-75=-750
-5x+75-75=-750
-5x=-750-75+75
-5x=-750
5x=750
x=750/5
x=150
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pour x=2
(2-7+(-8))*(-5)-75
=(2-7-8)*(-5)-75
=-13*(-5)-75
=85-75
=10
pour x=-3.2
(-3.2-7+(-8))*(-5)-75
=(-10.2-8)*(-5)-75
=-18.2*(-5)-75
=91-75
=16
Pour obtenir -750:
(x-7+(-8))*(-5)-75=-750
(x-15)*(-5)-75=-750
-5x+75-75=-750
-5x=-750-75+75
-5x=-750
5x=750
x=750/5
x=150