Respuestas

  • Usuario de Brainly
2013-02-10T21:41:07+01:00

Te ayuDo con 4 ejercicios Ok :

El primero :

2*(x+5) = 9x+31

2x +10 = 9x +31

2x -9x = 31 -10

-7x = 21

x = -21/7

x = -3

El segunDo :

-*(x+3) = 2*(6+x)

-x-3 = 12+2x

-x -2x = 12+3

-3x = 15

x = -15/3

x = -5

El tercero :

-5*(6-5x) = 5x-10

-30 +25x = 5x-10

25x -5x = -10 +30

20x = 20

x = 20/20

x = 1

El cuarTo :

16+5x = x-3*(4+x)

16+5x = x-12-3x

16+5x = -2x -12

5x +2x = -12 -16

7x = -28

x = -28/7

x = -4

SaLuDos :)'

2013-02-10T21:57:08+01:00

1) 2(x + 5) = 9x + 31

    2x + 10 = 9x + 31

    10 - 31  = 9x - 2x

        - 21   =  7x

           x = - 21 / 7

           X = - 3

 

 

 

2)   -1(x + 3) = 2(6 + x)

       -x - 3  = 12 + 2x

      -3 -12 = 2x +x

        -15  = 3x

            x = -15 / 3

            X = - 5

 

3)   -5(6 - 5x) = 5x - 10

       -30 +25x = 5x - 10

      25x - 5x = -10 + 30

          20x = 20

             x = 20 / 20

            X = 1

 

4)  16 + 5x = x - 3(4 + x)

     16 + 5x = x - 12 - 3x

     5x -x + 3x = -12 -16

                7x = - 28

                 X = -28 / 7

                 X = - 4

 

5)  -3(6  - 6x) -3 = x - 4

      -18 + 18x -3 = x - 4

      -21 + 4 = x - 18x

            -17 = - 17x

               X = -17 / -17

               X = 1

 

6) -6x = 3(5x + 8) - 3

     -6x = 15x + 24 - 3

    -6x - 15x = 21

         -21x = 21

             x = 21 / -21

            x = -1