Sagot :
bonjour
a. 8 - 4 x + 5 = - 6 x - 9 - 12
- 4 x + 6 x = - 21 - 8 - 5
2 x = - 34
x = - 17
b. ( 3 x + 1 ) / 4 = ( 5 x - 2 ) /5
15 x + 5 = 20 x - 8
15 x - 20 x = - 8 - 5
- 5 x = - 13
x = 13/5
c. x/3 + 5/6 = 1/2 - x
2 x /6 + 5/6 = 3/6 - 6 x /6
2 x + 6 x = 3 - 5
8 x = - 2
x = - 1 /4
d. x - x - 1 = x + 3 - x + 3
x - x - x + x = 3 + 3 + 1
0 x = 7
pas de solution
Bonjour,
Résoudre:
a. 8-4x+5= -6x-9-12
-4x+13+6x= -21
2x= -21-13
x= -34/2
x= -17
S= { -17 }
b. 5(3x+1)= 4(5x-2)
15x+5= 20x-8
15x-20x= -8-5
-5x= -13
x= 13/5
S= { 13/5 }
c. x/3 + x= 1/2-5/6
. (x+3x)/3= (1*3 -5)/6
4x/3 = -2/6
4x/3= -1/3
3(4x)= -1(3)
12x= -3
x= -3/12
x= -1/4
S= { -1/4 }
d. x-x-1= x+3-x+3
-1= 6
S= ∅