Aidez moi svp maths 3eme
Résoudre les équations suivantes :
a) 9x-6-8x=-4x+3+x
b) -4x-9x=-6x-11
c) 7x-2=-x-18
d) 2.3x-4.5=5.4-x
e) 199+255x=270x+169
Résoudre les équations suivantes :
a) 9x-6-8x=-4x+3+x
b) -4x-9x=-6x-11
c) 7x-2=-x-18
d) 2.3x-4.5=5.4-x
e) 199+255x=270x+169
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Verified answer
Bonsoir,Résoudre les équations suivantes :
a) 9x-6-8x=-4x+3+x
9x - 8x + 4x - x = 3 + 6
4x = 9
x = 9/4
x = 2,25
b) -4x-9x=-6x-11
- 4x - 9x + 3x = - 11
- 10x = - 11
x = 11/10
x = 1,1
c) 7x-2=-x-18
7x + x = - 18 + 2
8x = - 16
x = - 16/2
x = - 8
d) 2.3x-4.5=5.4-x
2,3x + x = 5,4 + 4,5
3,3x = 9,9
x = 9,9/3,3
x = 3
e) 199+255x=270x+169
255x - 270x = 169 - 199
- 15x = - 30
x = 30/15
x = 2
Verified answer
A) 9x - 6 - 8x = - 4x + 3 + x9x + 4x - x - 8x = 3 + 6
4x = 9
x = 9 / 4
x = 2,25
b) - 4x - 9x = - 6x - 11
- 4x - 9x + 6x = - 11
- 7x = - 11
x = - 11 / (- 7)
x = 11 / 7
c) 7x - 2 = - x - 18
7x + x = - 18 + 2
8x = - 16
x = - 16 / 8
x = - 2
d) 2,3x - 4,5 = 5,4 - x
2,3x + x = 5,4 + 4,5
3,3x = 9,9
x = 9,9 / 3,3
x = 3
e) 199 + 255x = 270x + 169
255x - 270x = 169 - 199
- 15x = - 30
x = - 30 / (- 15)
x = 2