Sagot :
bjr
il faut isoler les inconnues x à gauche
on aura donc
3/4x + 5/4 - 5/4 = 2 - 5/4
3/4x = 8/4 - 5/4
3/4x = 3/4
donc x = 1
2 - 7/2x = - 5
2 - 2 - 7/2x = - 5 - 2
7/2x * (-2/7) = -7 * (-2/7)
x = 2
-6 + 6 + 1/3x = -4/5 + 6
1/3x = -4/5 + 30/5
1/3x = 26/5
1/3x * 3/1 = 26/5 * 3/1
x = 78/5
x = 15,6
et
3x + 5 - 5 = 2/3x - 2 - 5
3x = 2/3x - 7
3x - 2/3x = 2/3x - 2/3x - 7
1/3x = -7
1/3x * 3 = -7 * 3
x = -21
Réponse :
bonjour
3 x /4 + 5/4 = 2
3 x /4 + = 8/4 - 5 /4
3 x = 3
x = 1
2 - 7 x /2 = - 5
- 7 x /2 = - 10/2 - 4/2
- 7 x = - 14
x = 2
- 6 + x/ 3 = - 4 /5
5 x /15 = - 12/15 + 90/5
5 x = 78
x = 78/5
3 x + 5 = 2 x /3 - 2
9 x /3 - 2 x /3 = - 6 /3 + 15/3
7 x = 9
x = 9/7
Explications étape par étape