Respostas

2014-08-22T20:30:06-03:00
A) 
3-(3x-6)=2x+(4-x)=
3 -3x + 6 = 2x +4 -x
-3x -2x + x = 4 -3 -6
-4x = -5
 
x~~=~~\dfrac{-5}{-4}

x~~=~~\dfrac{5}{4}

B)
3-x/ 8 = x+1 / 4 - x/ 3=

 Tiramos o mmc de 8, 4 e 3 = 24.

72 -3x = 24x +6 -8x
72 -6 = 24x -8x +3x
66 = 19x

x~~=~~\dfrac{66}{19}
2 5 2
2014-08-23T17:37:26-03:00
A) 3- 3x +6 = 2x + 4 –x
- 3x -2x +x = 4 -6-3
 -5x +x = -5
-4x=-5(-1)
X= 5/4
b) 3.(3-x)/24 = 6.(x+1)/24 - 8x/24
9 - 3x=6x+6 -8x
-3x -6x +8x =6 -9
-x= -3.(-1)
x= 3