bj un exos a faire pour demain help please : résoudre les equation suivantes: a) 5(x-2)=2x+(x+6) b)12-(5x-9)=4x+3 c) 5+3(2x+2)=6-4(x+1)
a) 5x-10 =2x+x+6 = 5x-2x-x =6+10
= 2x =16 x = 16/2 = 8
b) 12 -5x+9 = 4x+3
= -5x-4x = 3-12
= -9x = -9 donc x = 1
c) 5 +6x+6 = 6-4x-1
= 6x+4x =6-1-6-5
= 10x = -18 x = -18/10 = -9/5
5(x-2)=2x+(x+6)
5x - 10 = 2x + x + 6
5x - 10 = 3x + 6
2x -10 = 6
2x = 16
x = 16/2
x = 8
12 -(5x -9)=4x+3
12 -5X + 9 = 4x +3
-5x +21 = 4x + 3
-9x +21 = 3
-9x = -18
x= 18/9 = 2
5+3(2x+2)=6-4(x+1)
5 + (6x + 6) = 6 -(4X + 4)
5 + 6X + 6 = 6 -4X -4
6X + 11 = -4X + 2
10x + 11 = 2
10x = -9
x = -9/10