Question

4 przykłady z matmy na poniedzialek:

4(2x-3)=2(3x+2)=
4x+(5x-2)=5(2x-1)
3x-2(4x-5)=7x-(2x-3)
5(4x-3)=8x-12+(9x-2)

Dzięki :P :D

Answer 1

a)

8x - 12 = 6x + 4

8x - 6x = 4 + 12

2x = 16  /:2

x = 8

b)

4x + 5x - 2 = 10x - 5

4x +5x - 10x = -5 +2

-x = -3  /*(-1)

x = 3

c)

3x - 8x + 10 = 7x -2x + 3

-5x + 10 = 5x + 3

-5x - 5x = 3 - 10

-10x = -7   /:(-10)

x = 7/10    x = 0,7

d)

20x - 15 = 8x - 12 + 9x - 2

20x - 15 = 17x - 14

20x - 17x = -14 + 15

3x = 1   /:3

x = 1/3

Answer 2

a)

8x - 12 = 6x + 4

8x - 6x = 4 + 12

2x = 16  /:2

x = 8

b)

4x + 5x - 2 = 10x - 5

4x +5x - 10x = -5 +2

-x = -3  /*(-1)

x = 3

c)

3x - 8x + 10 = 7x -2x + 3

-5x + 10 = 5x + 3

-5x - 5x = 3 - 10

-10x = -7   /:(-10)

x = 7/10    x = 0,7

d)

20x - 15 = 8x - 12 + 9x - 2

20x - 15 = 17x - 14

20x - 17x = -14 + 15

3x = 1   /:3

x = 1/3