Sagot :
Bonsoir,
a) 2x-2=2
2x = 2+2
2x = 4
x= 4/2
x = 2
b) 3x-10=11
3x = 11+10
3x = 21
x= 21/3
x= 7
c) 1+5x= -39
5x = -39 -1
5x = -40
x= -40/5
x = -8
d) 2+3x=9
3x= 9-2
3x = 7
x= 7/3
e) 8x=12x+4
-4 = 12x -8x
-4 = 4x
x= 4/4
x=1
f) 7x+1=-4-x
7x+x = -4 -1
8x = -5
x= -5/8
a) 2x-2=2 b) 3x-10=11
+2-2+2x=2+2 +10-10+3x=11+10
2x:2 = 4:2 3x:3 = 21:3
x=2 x=7
c)1+5x=-39 d)2+3x=9
-1+1+5x=-39-1 -2+2+3x=9-2
5x:5 = -40:5 3x:3 = 7:3
x=-8 x~ 2,3
e)8x=12x+4 f)7x+1=-4-x
-12x+8x=4+12x-12x -1+1+7x=-4-x-1
-4x=4 +7x+x=-5-x+x
x=-4 8x:8 = -5:8
x~ -0,6
+2-2+2x=2+2 +10-10+3x=11+10
2x:2 = 4:2 3x:3 = 21:3
x=2 x=7
c)1+5x=-39 d)2+3x=9
-1+1+5x=-39-1 -2+2+3x=9-2
5x:5 = -40:5 3x:3 = 7:3
x=-8 x~ 2,3
e)8x=12x+4 f)7x+1=-4-x
-12x+8x=4+12x-12x -1+1+7x=-4-x-1
-4x=4 +7x+x=-5-x+x
x=-4 8x:8 = -5:8
x~ -0,6