Question

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

B. 10+ ( x-2) = 5 - (x +4)

C. 4. (x-2) - 2 (x+1) = 4

D. X + x/4 - 20

E. X/2 - X/ 5 = 21

Answer 1

Opa! Como vai minha consagrada?

É bastante simples. No meu perfil, se eu não me engano, resolvi uma questão desse tipo com as regras e tudo mais. Dê uma passadinha lá e confira.

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a) 2 · (x - 2) + 3 · (2x + 2) = -5 · (2-x)

  2x - 4 + 6x + 6 = -10 + 5x

  2x +6x - 5x = -10 -6 +4

  3x = -12

  x = -12 : 3

  x = -4

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b)  10 + (x - 2) = 5 - (x + 4)

    10 + x -2 = 5 -x -4

    x + x = 5 -4 +2 -10

   2x = -7

   x = -7 : 2

   x = -3,5

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c) 4 · (x - 2) - 2 (x + 1) = 4

  4x -8 -2x -2 = 4

  4x - 2x = 4 +2 +8

  2x = 14

  x = 14 :2

  x = 7

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d)  $\frac{x}{1}$ + $\frac{x}{4}$ = 20

   $\frac{2x}{4}$ = 20

  2x = 20 : 4

  2x = 5

  x = 5 : 2

  x = 2,5

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e) $\frac{x}{2} - \frac{x}{5}$ = 21

   $\frac{5x}{10} - \frac{2x}{10}$ = 21

   $\frac{3x}{10}$ = 21

   3x = 21 : 10

   x = 2,1 : 3

   x = 0,7

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Espero ter te ajudado! Bjos e bons estudos.