Answered

bonjour aidez moi svp
Résoudre les équations suivantes.
1) 13-5x = 4x-27
2) 3x-5/7x+3=3/4
3)3x+1/3-x+1/2=1/6
merci d'avance​

Sagot :

Bonjour,

1) 13-5x = 4x-27

13+27 = 4x +5x

40 = 9x

x= 40/9

2) 3x-5/7x+3=3/4

3x -5x/7 = 3/4 -3

21x/7 -5x/7 = 3/4 - 12/4

16x/7 = -9/4

16x = -9/4 * 7

16x = -63/4  

x=( -63/4)/16

x= -63/( 4*16)

x= -63 /64

3)3x+1/3-x+1/2=1/6

3x-x = 1/6 -1/3 -1/2

2x = 1/6 -2/6 -3/6

2x =-4/6

2x = -2/3

x= (-2/3) /2

x= -2/( 3*6)

x= -2/18

x= -1/9