Question

to moja praca długoterminowa z matmy czekam na rozwiązanie

Answer 1

zad.1

 7x + 6 + 4x = 9 – 2x + 7 + 81

7x + 4x + 2x = 9 + 7 + 81 – 6

13x = 91   / 13

x = 7

 

zad.2

8x – 13 + 101 = 22x + 18

8x – 22x = 18 + 13 – 101

- 14x = -70      / : (-14)

x = 5

 

zad.3

2(x-4) + 3(2x+3) = 4(x+2) – 5(1-x)

2x – 8 + 6x + 9 = 4x + 8 – 5 + 5x

2x + 6x – 4x – 5x = 8 – 5 +8 – 9

-x = 2      /* (-1)

x = -2

 

zad.4

2(x + 2 ) – 3( x – 1) + 8 = 3x – 1

2x + 4 – 3x + 3 + 8 = 3x – 1

2x -3x – 3x = -1 -4 -3 – 8

-4x = -16     / : (-4)

x = 4

 

zad. 5

4y – 18 + 7y = 1 + 9y – 18

4y + 7y – 9y = 1 – 18 + 18

2y = 1      / :2

y = ½

 

zad.6

3x – 8 + 2x = 16 – 3x – 8 – x

3x + 2x + 3x + x = 16 – 8 + 8

9x = 16         / : 9

x = 16/9

x = 1 i 7/9

 

zad. 7

5(x-3) – 5x = 7

5x – 15 – 5x = 7

5x – 5x = 7 + 15

0 = 22

 

zad. 8

-3x + 17 + x = 11x + 2 + 2x

-3x + x – 11x – 2x = 2 – 17

-15x = -15      / : (-15)

x = 1

 

zad. 9

3(x+4) -5(x-1) + 6 = 2x – 1

3x + 12 – 5x + 5 + 6 = 2x – 1

3x – 5x – 2x = -1 – 12 – 5 – 6

-4x = -24       / : (-4)

  x = 6

 

zad. 10

3(2x + 5) + 4(-x+3) = 2(3x + 15) + 2( 3x – 5)

6x + 15 – 4x + 12 = 6x + 30 + 6x – 10

6x – 4x – 6x – 6x = 30 – 10 – 15 – 12

-10x = - 7       / : (-10)

   X= 7/10

 

Zad. 11

4x – 3x – 21 – 5x + 2x – 2 = 9

4x – 3x – 5x + 2x = 9 + 2 + 21

- 2x = 32       / : (-2)

    x = -16

 

zad. 12

5(6x+4) – 7(4x + 2) = 6(4x + 8) -3(2x+42)

30x + 20 – 28x – 14 = 24x + 48 – 6x – 126

30x – 28x – 24x + 6x = 48 – 126 – 20 + 14

-16x = -84       /: (-16)

  x = 84/16

  x = 5 i 4/16

  x = 5 i 1/4

 

zad. 13 do 18 w załączniku