Equation:A) 4x + 2 = 3x + 5 b) (x + 5)/(2x) = 3 c) x/5+(x+3)/2 = 4
Mathématiques
spiderboy
Question
Equation:A) 4x + 2 = 3x + 5
b) (x + 5)/(2x) = 3
c) x/5+(x+3)/2 = 4
1 Réponse
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1. Réponse Omnes
Salut,
A)
4x + 2 = 3x + 5
4x - 3x = 5 - 2
x = 3
B )
(x + 5)/(2x) = 3
(x+5) / 2x - 3 = 0
(x+5)/2x - (3*2x)/2x = 0
(x+5 - 6x) / 2x = 0
(5 -5x) / 2x = 0
2x ≠0
x ≠ 0
5-5x = 0
5 = 5x
x = 1
C)
x/5+(x+3)/2 = 4
2x / 10 + 5(x+3) /10 - 40/10 = 0
(2x + 5x + 15 - 40 )/ 10 =0
(7x - 25) / 10 = 0
7x - 25 = 0
7x = 25
x = 25/7
Bonne soirée !