Pouvez-vous me dire mes réponses svp merci. •(5x+1) (8-x)=0 • (3X-1) +(7-x)=0 •(8+3x) -(x+3)=0

bonjour,




•(5x+1) (8-x)=0
5x+1  =0
5x =-1
x =-1/3
8-x =0
-x = -8
x = 0

• (3X-1) +(7-x)=0
3x-1+7-x = 0
2x+6  =0
2x =-6
x =-6/2 = -3
 
•(8+3x) -(x+3)=0
8+3x-x-3 = 0
tu finis

Bonsoir,

•(5x+1) (8-x)=0 
5x + 1 = 0         ou        8 - x = 0
5x = - 1             ou        x = - 8
x = - 1/5

• (3X-1) +(7-x)=0
3x - 1 + 7 - x = 0
3x - 1 = 1 - 7
2x = - 5
x = - 5/2
x = - 2,5

•(8+3x) -(x+3)=0
8 + 3x - x - 3 = 0
3x - x = 3 - 8
2x = 5
x = 5/2
x = 2,5