Question

EXERCITIILE 8,9,10 (puteti sa il trimiteti pe care stiti sa il faceti) URGENTTTTTTTTTTTT

Answer 1

Răspuns:

Explicație pas cu pas:

8.

a)

/x/ = 3

x = {-3; 3}

b)

2/x/ - 3 = 5

2/x/ = 3 + 5 = 8

/x/ = 8 : 2 = 4

x = {-4; 4}

c)

/2x - 1/ = 17

2x - 1 = 17

2x = 17 + 1 = 18

x = 18 : 2 = 9

2x - 1 = -17

2x = 1 - 17 = -16

x = -16 : 2 = -8

x = {-8; 9}

d)

3/x + 1/ + 5 = /x + 1/ + 11

3/x + 1/ - /x + 1/ = 11 - 5

2/x + 1/ = 6

/x + 1/ = 6 : 2 = 3

x + 1 = 3

x = 3 - 1 = 2

x + 1 = -3

x = -3 - 1 = -4

x [ {-4; -3}

e)

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

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

3/2x - 1/ = 9

/2x - 1/ = 9 : 3 = 3

2x- 1 = 3

2x = 1 + 3 = 4

x = 4: 2 = 2

2x - 1 = -3

2x = 1 - 3 = -2

x = -2: 2 = -1

x = {-1; 2}

__________________

9.

x + x + 1 + x + 2 + x + 3 + x + 4 = 5

5x + 10 = 5

5x = 5 - 10 = -5

x = -5 : 5 = -1

numerele sunt: -1; 0; 1; 2; 3