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mimidu69
@mimidu69
June 2021
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Aider-moi svp j'ai ce DM à faire et je n'ai rien compris aux équations !! SVP aider-moi !
Merci d'avance !! :)) Seulement les exercices 1 et 2 de la partie des activités numériques! Merci bcp !!
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winner123
Verified answer
Bonsoir
Exercice 1
a) 2(x-3) - (2x+1)
⇒ 2x - 6 - 2x -1 =
-7
b) (-x +4)(2x -1)
⇒ -2x² +x +8x - 4 =
-2x² +9x -4
c) -2x (x-4) - ( -x +4)
⇒ -2x² +8x +x -4
= - 2x² +9x -4
Exercice
2
a) 1 -2 (t -5) = 3(2 -4t)
⇒ 1 - 2t +10 = 6 - 12t
⇒ -2t +12t = 6 - 1 -10
⇒ 10t = -5 ⇒ t = -5/10 =
-1/2
b) -3x/3 = 7/5
⇒ -15x = 21 ⇒ x = -21/15 =
- 7/5
0 votes
Thanks 1
mimidu69
tu as développer ds l'ex 1 ?
winner123
oui
mimidu69
ok merci !
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Verified answer
BonsoirExercice 1
a) 2(x-3) - (2x+1)
⇒ 2x - 6 - 2x -1 = -7
b) (-x +4)(2x -1) ⇒ -2x² +x +8x - 4 = -2x² +9x -4
c) -2x (x-4) - ( -x +4)
⇒ -2x² +8x +x -4 = - 2x² +9x -4
Exercice 2
a) 1 -2 (t -5) = 3(2 -4t)
⇒ 1 - 2t +10 = 6 - 12t
⇒ -2t +12t = 6 - 1 -10
⇒ 10t = -5 ⇒ t = -5/10 = -1/2
b) -3x/3 = 7/5
⇒ -15x = 21 ⇒ x = -21/15 = - 7/5