Question

Proszę o zadanie 15, daje naj <3

Answer 1

Odpowiedź:

zad 15

a)

x/15 = 4/3

3x = 15 * 4

3x = 60

x = 60/3 = 20

b)

(3 - 2x)/12 = 3/2

2(3 - 2x) = 12 * 3

6 - 4x = 36

- 4x = 36 - 6

- 4x = 30

4x = - 30

x = - 30/4 = - 7 2/4 = - 7 1/2

c)

6/(2 - 3x) = 3/7 ; x ≠ 2/3

7 * 6 = 3(2 - 3x)

42 = 6 - 9x

9x = 6 - 42

9x = - 36

x = - 36/9 = - 4

d)

4/(1 - x) = 3/(1 + x ) ; x ≠ 1 i x ≠ - 1

4(1 + x) = 3(1 - x)

4 + 4x = 3 - 3x

4x + 3x = 3 - 4

7x = - 1

x = - 1/7