Question

a- 3.(x+4) - 6 = 2x +7

b- 3x-10=5x+7

c- 4.(2x-5)-2.(x-8)=7x+1

d x+3 + x = 3
4 2

e- x-1 - 2x+3 = x+6
2 5

Answer 1

Resposta:

a) 3.(x+4) - 6=2x+7

3x+12-6 = 2x+7

3x - 2x = 7+6-12

x = 13-12

x = 1

b)3x-10=5x+7

-10-7 = 5x-3x

-17 = 2x

x = 17/2

c)4.(2x-5) - 2.(x-8)=7x+1

8x-20-2x+16 = 7x+1

8x-2x-7x = 1+20-16

-x = -5.(-1)

x = 5

d)(x+3) + x  = 3      

 --------   ----   -----

     4        2      1                OBS: Tirando o mmc:

x+3+2x = 12

------------------

        4                                OBS: Eliminando o 4 temos:

x+3+2x = 12

x+2x = 12-3

3x = 9

x = 9/3

x = 3

e) (x-1) - (2x+3) = (x+6)

  --------   ---------   --------    

      2          5           1                    OBS: tirando o mmc:

5x-5-4x+6 = 10x+60

-----------------------------

             10                          OBS: cortando o 10:

5x-5-4x+6 = 10x+60

5x-4x-10x = 60+5-6

-9x = 59(-1)

9x = -59

x = -59/9