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Rozwiąż podane równania :


2x - 1 = x + 7

3(x - 2) = 2x - 1

4x + 7 = 3(x - 2)

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


Wykonaj działania na sumach algebraicznych :


3 (x - 2) + 4 (x -2)

8 (x + 4) - 5 (x + 4)


Odpowiedź :

Cześć ;-)

Zadanie 1

2x - 1 = x + 7

2x - x = 7 + 1

x = 8

3(x - 2) = 2x - 1

3x - 6 = 2x - 1

3x - 2x = -1 + 6

x = 5

4x + 7 = 3(x - 2)

4x + 7 = 3x - 6

4x - 3x = -6 - 7

x = -13

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

-2x - 4 = 6 - 3x

-2x + 3x = 6 + 4

x = 10

Zadanie 2

3(x - 2) + 4(x - 2) =

= 3x - 6 + 4x - 8 =

= 3x + 4x - 6 - 8 = 7x - 14

8(x + 4) - 5(x + 4) =

= 8x + 32 - 5x - 20 =

= 8x - 5x + 32 - 20 = 3x + 12

Pozdrawiam! ~ JulkaOdMatmy