Question

zadanie 3 strona 52 matematyka z plusem klasa 8​

Answer 1

Odpowiedź:

Szczegółowe wyjaśnienie:

a) 2x + 17 =26-x|+x

3x + 17 = 26 | - 17

3x =9|:3

x = 3

b) 11 - x = 3x + 8

11 = 4x + 8

3 = 4x

x = 3/4

- 7x - 14 + 4 = - 3x

c) - 7(x + 2) + 4 = - 3x - 7x - 10 = - 3x -10= 4xy |:4 7x

x = - 10/4 = - 5/2 = - 2 1/2

1:4

-8

பd) - 4(1/2 * x - 2) - 4 = 2(- x + 2)

- 2x + 8 - 4 = - 2x + 4

- 2x + 4 = - 2x + 4

0 = 0

Równanie tożsamościowe

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

e) 2x(x - 1) = 2(x - 1)(x + 3) 2x ^ 2 - 2x = 2(x ^ 2 + 2x - 3) 2x ^ 2 - 2x =2x^ 2 +4x-6|-2x^ 2

- 2x = 4x - 6

- 6x = - 6

|: (- 6)

x = 1

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

6x ^ 2 + 3x + 4x + 2 = 6x ^ 2 + 6x - 3x - 3

6x ^ 2 + 7x + 2 = 6x ^ 2 + 3x - 3

7x + 2 = 3x - 3

4x + 2 = - 3

4x = - 5

| - 3x

| - 6x ^ 2

4