Respuestas

2013-08-21T06:40:59+02:00
1.      2(x-10)= - 6(2-x)-6x
2x -20 = -12-6x-6x
2x+12x = -12+20
14x = 8
x= 8/14
x= 4/7

2.  (x+1)-3(x-2)=x+6
(x+1)(-3x+6)= x+6
-3x^2+6x-3x+6= x+6
-3x^2+2x= 0
x(-3x+2)=0
x1=0 x2= 2/3

ec. de segundo grado