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Guizoo
@Guizoo
May 2019
1
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Bonjour,
Résoudre les équations suivantes :
a) -5x + 4/3 = 8 b) 3x/2 - 4 = 5/4
c) 3/2x + 5/3 = 3 d) 2x/7 - 5/7 = 3/4
e) -2x/8 - 5/8 = 3x/2 - 7/2
Merci à tout ceux qui m'aderont
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xabernard
Re-bonjour,
Voici...
a)
-5x + 4/3 = 8
-5x = 8 - 4/3
-5x = 24/3 - 4/3
-5x = 20/3
x = -4/3
b)
3x/2 - 4 = 5/4
3x/2 = 5/4 + 4
3x/2 = 5/4 + 16/4
3x/2 = 21/4
x = (21/4).(2/3)
x = 7/2
c)
3/2x + 5/3 = 3
3/2x = 3 - 5/3
3/2x = 9/3 - 5/3
3/2x = 4/3
4.2x = 3.3
8x = 9
x = 9/8
d)
2x/7 - 5/7 = 3/4
2x/7 = 3/4 + 5/7
2x/7 = 21/28 + 20/28
2x/7 = 41/28
x = (41/28).(7/2)
x = 41/8
e)
-2x/8 - 5/8 = 3x/2 - 7/2
-2x/8 - 3x/2 = -7/2 + 5/8
-2x/8 - 12x/8 = -28/8 + 5/8
-14x/8 = -23/8
x = 23/14
2 votes
Thanks 1
Guizoo
Merci beaucoup
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Voici...
a)
-5x + 4/3 = 8
-5x = 8 - 4/3
-5x = 24/3 - 4/3
-5x = 20/3
x = -4/3
b)
3x/2 - 4 = 5/4
3x/2 = 5/4 + 4
3x/2 = 5/4 + 16/4
3x/2 = 21/4
x = (21/4).(2/3)
x = 7/2
c)
3/2x + 5/3 = 3
3/2x = 3 - 5/3
3/2x = 9/3 - 5/3
3/2x = 4/3
4.2x = 3.3
8x = 9
x = 9/8
d)
2x/7 - 5/7 = 3/4
2x/7 = 3/4 + 5/7
2x/7 = 21/28 + 20/28
2x/7 = 41/28
x = (41/28).(7/2)
x = 41/8
e)
-2x/8 - 5/8 = 3x/2 - 7/2
-2x/8 - 3x/2 = -7/2 + 5/8
-2x/8 - 12x/8 = -28/8 + 5/8
-14x/8 = -23/8
x = 23/14