Réponses

2013-03-29T09:27:28+01:00

3(x + 4) = 5( x-2)

12 + 10 = 5x - 3x

         22 = 2x

            x = 22/2

            x = 11

 

-4(3-x) = 2( 3x + 5)

4x - 6x = 10 + 12

    - 2x = 22

        x = -22/2

       x = -11

2013-03-29T09:52:34+01:00

A = 3(x+4) = 5(x-2)

A = 3x +12 = 5x -10

A = 3x -5x = -12 -10

A = -2x = -22

A = x = -22/2 = 11

 

B = -4(3-x) = 2(3x+5)

B = -12 +4x = 6x +10

B = +4x -6x = +12 +10

B = -2x = 22

B = x= 22/2 = 11