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Lucymaths
@Lucymaths
May 2019
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EQUATIONS/ Bonjour, pourriez-vous m'aider pour ces exercices en Maths svp? Merci d'avance.
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nguyenso9
Verified answer
Bonsoir,
Exercice 1 :
a) Soit x = 5
5 * 5 + 3 = 28
3 * 5 - 7 = 8
Les resultats sont distincts, l'affirmation est donc fausse.
b) soit t = -10
-5 (-10 - 2) = -5 * (-12) = 60
-4 * (-10) = 40
Les resultats ne sont pas identiques, l'affirmation est donc fausse.
c) Soit x = 6
2 * 6² - 3 * 6 - 21 = 33
4 * 6 + 9 = 33
Les resultats sont identiques, l'affirmation est vraie.
Exercice 2 :
a)
7 - 8x = 56
7 + 56 = 8x
63 = 8x
63/8 = x
b)
6x - 4 = 3x + 14
6x - 3x = 14 + 4
3x = 18
x = 18/3
x = 6
c)
5 (x - 3) - 3x + 7 = 9
5x - 15 - 3x + 7 = 9
2x - 8 = 9
2x = 9 + 8
2x = 17
x = 17/2
x = 8,5
d)
7/3x + 5 = 7 - 5/3x
7/3x - 5/3x = 7 - 5
2/3x = 2
x = 2 * 3/2
x = 3
1 votes
Thanks 1
Lucymaths
Mercii
nguyenso9
Dr
Liberté12
Bonjour
nounours2k18
Exercice 1
a. 5x + 3 = 3x - 7
5x - 3x = -7-3
2x / 2 = -10 /2
x = -5
Donc 5 n'est pas solution de l'équation.
Exercice 2
a. 7 - 8x = 56
-8x = 56-7
-8x = 49
-8x/-8 = 49/-8
x = -6.125
b. 6x - 4 = 3x + 14
6x-3x = 14+4
3x = 18
3x / 3 = 18/ 3
x = 6
c. 5(x-3) - 3x+7 = 9
5x -15 - 3x + 7 = 9
5x -3x = 9 +15 -7
2x = 17
2x/2 = 17/2
x = 8.5
0 votes
Thanks 0
Lucymaths
Merci
nounours2k18
De rien
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BONJOUR SVP J'AURAIS VRAIMENT BESOIN D'AIDE POUR CET EXERCICE EN MATHS SVP SUR LA TRIGONOMETRIE!!!
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Verified answer
Bonsoir,Exercice 1 :
a) Soit x = 5
5 * 5 + 3 = 28
3 * 5 - 7 = 8
Les resultats sont distincts, l'affirmation est donc fausse.
b) soit t = -10
-5 (-10 - 2) = -5 * (-12) = 60
-4 * (-10) = 40
Les resultats ne sont pas identiques, l'affirmation est donc fausse.
c) Soit x = 6
2 * 6² - 3 * 6 - 21 = 33
4 * 6 + 9 = 33
Les resultats sont identiques, l'affirmation est vraie.
Exercice 2 :
a)
7 - 8x = 56
7 + 56 = 8x
63 = 8x
63/8 = x
b)
6x - 4 = 3x + 14
6x - 3x = 14 + 4
3x = 18
x = 18/3
x = 6
c)
5 (x - 3) - 3x + 7 = 9
5x - 15 - 3x + 7 = 9
2x - 8 = 9
2x = 9 + 8
2x = 17
x = 17/2
x = 8,5
d)
7/3x + 5 = 7 - 5/3x
7/3x - 5/3x = 7 - 5
2/3x = 2
x = 2 * 3/2
x = 3
a. 5x + 3 = 3x - 7
5x - 3x = -7-3
2x / 2 = -10 /2
x = -5
Donc 5 n'est pas solution de l'équation.
Exercice 2
a. 7 - 8x = 56
-8x = 56-7
-8x = 49
-8x/-8 = 49/-8
x = -6.125
b. 6x - 4 = 3x + 14
6x-3x = 14+4
3x = 18
3x / 3 = 18/ 3
x = 6
c. 5(x-3) - 3x+7 = 9
5x -15 - 3x + 7 = 9
5x -3x = 9 +15 -7
2x = 17
2x/2 = 17/2
x = 8.5