atividades do 3° bimestre

Laura Freitas Caires - 2°C

Atividades do 3° Bimestre

Inequações de 1° grau

2. 9x + 2(3x – 4) > 11x – 14 9x + 6x – 8 > 11x – 14 15x – 8 > 11x – 14 4x > – 6 x > -6/4 x > -3/2 x= -1

3. 2x + 4 > x – 9 2x + 4 > x – 9 2x – x > – 9 – 4 x > – 13

4. x – 4 < -3x + 12 x – 4 < -3x + 12 x + 3x < 12 + 4 4x < 16 x < 16/4 x< 4

5. 3x – 8 ≥ 2 – x 3x – 8 ≥ 2 – x 3x + x ≥ 2 + 8 4x ≥ 10 x ≥ 10/4 x ≥ 5/2

7. -x + 25 < 12 -x + 25 - 25 < 12 - 25 -x < -13 (-1) . -x > -13 (-1) x > 13

6. -2x ≥ 8 -2x/-2 < 8/-2 x </= - 4

1. 4 – 3x > -2 – 3x > -2 – 4 – 3x > -6 3x < 6 x < 6/3 x < 2

13. 2 + 3x/5 ≤ x + 1/2 20 + 6x ≤ 10x + 5 6x - 10x ≤ 5 - 20 -4x ≤ -15 (-1) 4x ≥ 15 x ≥ 15/4

9. 6 - 2x < 0 -2 x 2 - 6 (-1) 2x > 6 x > 6/2 x > 3

12. x + 7 > 9 x > 9 - 7 x > 2

8. 8 - 3 (2x - 1) < 0 8 - 6x + 3 < 0 8 + 3 < 6 11 < 6x 11/6 < x

11. 5x - 8 > 3x + 16 5x - 3x > 16 + 8 2x > 24 x > 24/2 x > 12

14. 4.( x + 3) > 2 (x - 1) 4x + 12 > 2x - 2 2x > -14 x > -14/2 x > -7

10. 2(x - 1) < x 2x - 2 < x 2x - x < 2 x < 2

16. 2x -1 > 3 2x - 1 2x - 1 (+1) > 3 (+1) 2x > 4 2x /2 > 4/2 x > 2

17. x + 2 ≤ 3x - 5 x - 3x ≤ - 5 - 2 -2x -7/-2 x ≥ 7/2

15. 9x - 7 > 6x + 20 9x - 6x > 20 + 7 3x > 13 x > 13/3 x > 4,3

18. -3x + 10 > - 2 -3x > -2 - 10 -3x/-3 > -12 /-3 x < 4

19. 4 (x + 1) -5 ≤ 2 (x + 3) 4x - 1 ≤ 2x + 6 4x -2 ≤ 6 + 1 2x/ 2 ≤ 7/2 x ≤ 3,5

20. x + 12 > 7 x > 7 - 12 x > -5

Parte 2

funções de Primeiro Grau (afim e linear)

1- f(x) = 3x + 1 f(1)= 3x + 1 f(1) = 3∙1 + 1 f(1) = 3 + 1 f(1) = 4 f(-2) = 3∙(–2) + 1 f(–2) = –6 + 1 f(–2) = –5

2- F(x) = -2 + 3 5= -2x + 3 2x= 3 - 5 2x= -2 x= -2 /2 x= -1

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

4. f(x)= 5x + 2 f(2)= 5 . 2 + 2 10 + 2 f(2) = 10

5. f(x) 3x - 9 f(-4) = 3 . (-4)-9 f(-4)= -12 - 9 f(-4) = - 21

6. f(x) 3x - 9 f(-2)= 3 . (-2) - 9 f(-2)= -6 - 9 f(-2)= -15

7. f(x) 3x - 9 f(4) 3. 4 - 9 f(4) 12 - 9 f(4)= 3

8. f(x)= 3x - 9 f(6) =3.6 - 9 f(6)= 18 -9 f(6)= 9

9. f(x) = 3x - 9 f(-8) = 3 . (-8) - 9 f(-8) = -24 - 9 f(-8) = - 33

13. f(x) = 4x + 6 4x + 6 = 0 4x = - 6 x = -1,5

14. f(x) 10x + 20 10x +20 = 0 10x = -20 x= -20/10 x = -0,5

15. f(x) 50x + 15 50x + 15 = 0 50x = -15 x = -15/50 x= 0,3

16. 114x + 4 114x + 4 = 0 114x = -4 x = -4/114 x= 0,035

17. f(x) = -4x -2x = 0 x= 0 /-4 x = 0

18. f(x) = 7x 7x = 0 x = 0/7 x = 0

11. y = 5x + 2 5x + 2 = 0 5x = – 2 x = – 2 /5

12. y = – 2x – 2x = 0 x = 0 : 2 x = 0

10. f(x) = 5x - 10 f(4) = 5. 4 - 10 f(4) = 20 - 10 f(4) = 10

20. f(x) = 120x 120x = 0 x = 0 : 120 x= 0

19. f(x) = 15x 15x = 0 x = 0 : 15 x = 0

Laura Freitas Caires - 2°C manhã