Question

Va rog mult la 4, 1, 2

Answer 1

Răspuns:

Explicație pas cu pas:

a)

(2x + 1)/3 = 4x/5

5(2x + 1) = 12x

10x + 5 = 12x

12x - 10x = 5

2x = 5

x = 5/2

_________

b)

4/x^2 = 49/9

49x^2 = 9*4 = 36

x^2 = 36/49

x1 = 6/7

x2 = -6/7

______________

1.

a)

5/11 = x/22

x = 22*5/11 = 10

b)

3(3 - 2x) = 8

9 - 6x = 8

6x = 9 - 8 = 1

x = 1/6

_________________

2.

a)

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

9x - 3 = 2x + 4

9x - 2x = 3 + 4

7x = 7

x = 1

b)

2(x^2 + x) = 4x

x^2 + x = 2x

x^2 - x = 0

x(x - 1)= 0

x = 0

sau x - 1 = 0; x = 1