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Alison27
@Alison27
January 2021
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Bonjour, je dois faire des calculs en maths mais je n’arrive pas. J’ai réussi à faire le A mais pour le reste j’ai essayé plusieurs fois en remplaçant les lettre par un chiffre mais ça ne donne pas le même résultat. Pourriez vous m’aide svp?
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calinizou
Verified answer
Bonjour
a = 5(a+2)-(6a-7)=
5a+10-6a+7=
-a+17
b= -b(3b+7)+(5-b)*b=
-3b²-7b+5b-b²=
-4b²-2b
c= -c(4+3c)-(9-2c+6c²)=
-4c-3c²-9+2c-6c²=
-9c²-2c-9
d= -5d+5d(d-2)-6(7-3d)=
-5d+5d²-10d-42+18d=
5d²+3d-42
0 votes
Thanks 1
Alison27
Merci énormément!!!
calinizou
de rien j'espére que tu as compris
Alison27
Oui merci
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Verified answer
Bonjoura = 5(a+2)-(6a-7)=
5a+10-6a+7=
-a+17
b= -b(3b+7)+(5-b)*b=
-3b²-7b+5b-b²=
-4b²-2b
c= -c(4+3c)-(9-2c+6c²)=
-4c-3c²-9+2c-6c²=
-9c²-2c-9
d= -5d+5d(d-2)-6(7-3d)=
-5d+5d²-10d-42+18d=
5d²+3d-42