4.. Résoudre les équations suivantes d'inconnue x (9) 3x +15 = 60 b)x - 21 = 49= d) 5 (4x-7)= 65 e) 4x - 11 = 8x - 25 (c) 2 (4-3x) = 26 (4) 5x +31 = 2xC + 64.
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il faut trouver x donc tu as juste à soustraire, diviser, multiplier ou ajouter
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Bonsoir;
3x +15 = 60
3x = 60-15
3x = 45
x = 45/3
x = 15
b)x - 21 = 49
x = 49+21
x = 70
d) 5 (4x-7)= 65
20x -35 = 65
20x = 65-35
20x = 30
x = 30/20
x = 3/2
x = 1,5
e) 4x - 11 = 8x - 25
-11+25 = 8x -4x
14 = 4x
x = 14/4
x = 3,5
(c) 2 (4-3x) = 26
8-6x =26
8-26 = 6x
-18 = 6x
x = -18/6
x = -3
5x +31 = 2x + 64.
5x - 2x = 64-31
3x = 33
x = 33/3
x =11