resolva as inequacoes
(é pra reslver nao é so a resposta)
1. X - 4 (X-1) < 19
2. 3 (X-1) - 2X > 10
3. 3 (2X - 1) < 5X + 7
4. 4 (X + 3) > 2 (X- 1)
5. 3 (X + 2) > 2 (2X + 4)
6. 5X - ( X-2) < 6
7. 7 (X -2) < 2 (3X + 4)
8. X+12 > 4 (2X -1) -3X
9. 2 (3X-1)-4 (X+2) <5X-1
10. 7 (3X-4) -4 (2X+3)> 2 (3X-5)
11. X/2 +1 < 5/3 - x
12. 2+ 3X/5 < X + 1/2
13. X - 1/3 > X/2 - 1/2 (DIVISÕES)
14.X/4 - 3/5 > X/10 - 1/2
15.X+ 2/10 -1 < 1-X/4
16. X/5 > 1/4 - 2-X/2
17. X/8 - 3/16 > X/24 - 2/3
18. 1/3 (X-2) - 3/5 < X/2 -1
19. X-1/4 + X/6 - X-2/3 > 0
20. 2 - 4X -1/9 < 1/3 + 2X -5/6
21 : X+6/3 - 2X+3/4
22. 3X -2/4 - 2X-1/5 - 1 < 7X-3/10
(BARRAS ASSIM EX: 45/6 É DIVISÃO)
Respostas
respondido por:
26
Resolva as inequacoes(é pra reslver nao é so a resposta)
1.
X - 4 (X-1) < 19
x -4(x - 1) < 19
x - 4x + 4 < 19
- 3x + 4 < 19
- 3x < 19 - 4
- 3x < 15 ( atenção DEVIDO ser(-3x) MUDA simbolo
x > 15/-3
x >- 15/3
x > - 5
2.
3 (X-1) - 2X > 10
3x - 3 - 2x > 10
3x - 2x - 3 > 10
1x - 3 > 10
1x > 10 + 3
1x > 13
x > 13/1
x > 13
3.
3 (2X - 1) < 5X + 7
6x - 3 < 5x + 7
6x - 3 - 5x < + 7
6x - 5x < + 7 + 3
1x < 10
x < 10/1
x = 10
4.
4 (X + 3) > 2 (X- 1)
4x + 12 > 2x - 2
4x + 12 - 2x> - 2
4x - 2x >- 2 - 12
2x > - 14
x > - 14/2
x > - 7
5.
3 (X + 2) > 2 (2X + 4)
3x + 6 > 4x + 8
3x + 6 - 4x > 8
3x - 4x > 8 - 6
- 1x > 2 ( DEVIDO ser (-1x) MUDA o simbolo
x < 2/-1
x < -2/1
x < - 2
6.
5X - ( X-2) < 6
5x - x + 2 < 6
4x + 2 < 6
4x < 6 - 2
4x < 4
x < 4/4
x < 1
7.
7 (X -2) < 2 (3X + 4)
7x - 14 < 6x + 8
7x - 14 - 6x < 8
7x - 6x < 8 + 14
1x < 22
x < 22/1
x < 22
8.
X+12 > 4 (2X -1) -3X
x + 12 > 8x - 4 - 3x
x + 12 > 8x - 3x - 4
x + 12 > 5x - 4
x + 12 - 5x > - 4
x - 5x > - 4 - 12
- 4x > -16 ( DEVIDO ser (-4x) MUDA simbolo
x < - 16/-4
x < + 16/4
x <
4
9.
2 (3X-1)-4 (X+2) <5X-1
6x - 2 - 4x - 8 < 5x - 1
6x - 4x - 2 - 8 < 5x - 1
2x - 10 < 5x - 1
2x - 10 - 5x <- 1
2x - 5x < - 1 + 10
- 3x < + 9 ( DEVIDO ser (-3x) MUDA o simbolo
x > 9/-3
x > - 9/3
x > - 3
10.
7 (3X-4) -4 (2X+3)> 2 (3X-5)
21x - 28 - 8x - 12 > 6x - 10
21x - 8x - 28 - 12 > 6x - 10
13x - 40 > 6x - 10
13x - 40 - 6x > - 10
13x - 6x > - 10 + 40
7x > 30
x > 30/7
11. X/2 +1 < 5/3 - x
x 5
---- + 1 < -------- - x SOMA com FRAÇÃO faz mmc = 2x3 = 6
2 3
3(x) + 6(1) < 2(5) - 6(x) fração com desigualdade(<) despreza o
------------------------------ denominador
6
3(x) + 6(1) < 2(5) - 6(x)
3x + 6 < 10 - 6x
3x + 6 + 6x < 10
3x + 6x < 10 - 6
9x < 4
x < 4/9
12.
2+ 3X/5 < X + 1/2
2 + 3x x + 1
--------- < ----------- FRAÇÃO < FRAÇÃO ( só cruzar)
5 2
2(2 + 3x) < 5(x + 1)
4 + 6x < 5x + 5
4 + 6x - 5x < 5
4 + 1x < 5
1x < 5 - 4
1x < 1
x < 1/1
x < 1
13.
X - 1/3 > X/2 - 1/2 (DIVISÕES)
x - 1 x 1
------ > ------- - ----- mmc 3x2 = 6
3 2 2
2(x - 1) > 3(x) - 3(1) instrução acima
-------------------------------
6
2(x - 1) > 3(x) - 3(1)
2x - 2 > 3x - 3
2x - 2 - 3x > - 3
2x - 3x > - 3 + 2
- 1x > - 1 atençã0 (-1x) acima
x < - 1/1
x < - 1
14.X/4 - 3/5 > X/10 - 1/2 mmc 4,5,10,2| 2
2,5, 5,1| 2
1,5,5,1 | 5
x 3 x 1 1,1,1,1/ = 2x2x5 = 20
---- - -------> ------ - ------
4 5 10 2
5(x) - 4(3) > 2(x) - 10(1)
--------------------------------------- idem acima
20
5(x) - 4(3) > 2(x) - 10(1)
5x - 12 > 2x - 10
5x - 12 - 2x > -10
5x - 2x > -10 + 12
3x > 2
x > 2/3
15.X+ 2/10 -1 < 1-X/4 10,4| 2
5,2| 2
2 x 5,1| 5
x + ------ - 1 < 1 - --------- 1,1/ = 2x2x5 = 20
10 4
20(x) + 2(2) - 20(1) < 20(1) - 5(x)
---------------------------------------------- idem
20
20(x) + 2(2) - 20(1) < 20(1) - 5(x)
20x + 4 - 20 < 20 - 5x
20x - 16 < 20 - 5x
20x - 16 + 5x < 20
20x + 5x < 20 + 16
25x < 36
x < 36/25
16. X/5 > 1/4 - 2-X/2
x 1 2 - x
--- > ----- - --------
5 4 2 mmc IGUAL acima =20
4(x) > 5(1) - 10(2 - x) idem acima
---------------------------
20
4(x) > 5(1) - 10(2 - x)
4x > 5 - 20 - 10x
4x > - 15 - 10x
4x + 10x > - 15
14x > - 15
x > - 15/14
17. X/8 - 3/16 > X/24 - 2/3 8.16.24.3| 2
4, 8,12,3| 2
2,4, 6,3| 2
x 3 x 2 1,2,3,3| 2
---- - ------- > ------ - -------- 1,1,3,3| 3
8 16 24 3 1,1,1,1/ = 2x2x2x2x3 = 48
6(x) - 3(3) > 2(x) - 16(2)
------------------------------------- idem acima
48
6(x) - 3(3) > 2(x) - 16(2)
6x - 9 > 2x - 32
6x - 9 - 2x > - 32
6x - 2x >- 32 + 9
4x > -23
x > -23/4
18. 1/3 (X-2) - 3/5 < X/2 -1
1(x - 2) 3 x
---------- - ------ < ------- - 1 mmc = 3x5x2 = 30
3 5 2
10[1(x - 2)] - 6(3) < 15(x) - 30(1)
---------------------------------------------- idem
30
10[1(x - 2)] - 6(3) < 15(x) - 30(1)
10[x - 2] - 18 < 15x - 30
10x - 20 - 18 < 15x - 30
10x - 38 < 15x - 30
10x - 38 - 15x < - 30
10x -15x > -30 + 38
- 5x < 8 ( DEVIDO ser (-5x) muda simbolo
x > 8/-5
x > - 8/5
19. X-1/4 + X/6 - X-2/3 > 0
x - 1 x x - 2
-------- + ---- - -------- > 0 mmc = 24
4 6 2
6(x - 1) + 4(x) - 12(x - 2) > 24(0)
-------------------------------------------- idem
24
6(x - 1) + 4(x) - 12(x - 2) > 24(0)
6x - 6 + 4x - 12x + 24 > 0
6x + 4x - 12x - 6 + 24 > 0
10x - 12x + 18 > 0
- 2x + 18 > 0
- 2x > - 18 ( deivido ser (-2x) fica <
x < -18/-2
x < + 18/2
x < 9
20. 2 - 4X -1/9 < 1/3 + 2X -5/6
1 1 2x - 5
2 - 4x - ------ < ---- + ---------- mmc = 18
9 3 6
18(2) - 18(4x) - 2(1) < 6(1) + 3(2x - 5) idem
--------------------------------------------------
18
18(2) - 18(4x) - 2(1) < 6(1) + 3(2x - 5)
36 - 72x - 2 < 6 + 6x - 15
36 - 2 - 72x < 6 - 15 + 6x
34 - 72x < - 9 + 6x
34 - 72x - 6x < - 9
34 - 78x < - 9
- 78x < - 9 - 34
- 78x <- 43 ( -78x) muda (>)
x > - 43/-78
x > + 43/78
21 : X+6/3 - 2X+3/4 ????????????? FALTA o simbolo?????
x + 6 2x + 3
------
22. 3X -2/4 - 2X-1/5 - 1 < 7X-3/10
3x - 2 2x - 1 7x - 3
-------- - ------------ - 1 < ----------- mmc = 20
4 5 10
5(3x - 2) - 4(2x - 1) - 20(1) < 2(7x - 3) idem
---------------------------------------------------------
20
5(3x - 2) - 4(2x - 1) - 20(1) < 2(7x - 3)
15x - 10 - 8x + 4 - 20 < 14x - 6
15x - 8x - 10 + 4 - 20 < 14x - 6
7x - 26 < 14x - 6
7x - 26 - 14x < - 6
7x - 14x < - 6 + 26
- 7x < 20 ( devido ser (-7x) (>)
x > 20/7
(BARRAS ASSIM EX: 45/6 É DIVISÃO)
1.
X - 4 (X-1) < 19
x -4(x - 1) < 19
x - 4x + 4 < 19
- 3x + 4 < 19
- 3x < 19 - 4
- 3x < 15 ( atenção DEVIDO ser(-3x) MUDA simbolo
x > 15/-3
x >- 15/3
x > - 5
2.
3 (X-1) - 2X > 10
3x - 3 - 2x > 10
3x - 2x - 3 > 10
1x - 3 > 10
1x > 10 + 3
1x > 13
x > 13/1
x > 13
3.
3 (2X - 1) < 5X + 7
6x - 3 < 5x + 7
6x - 3 - 5x < + 7
6x - 5x < + 7 + 3
1x < 10
x < 10/1
x = 10
4.
4 (X + 3) > 2 (X- 1)
4x + 12 > 2x - 2
4x + 12 - 2x> - 2
4x - 2x >- 2 - 12
2x > - 14
x > - 14/2
x > - 7
5.
3 (X + 2) > 2 (2X + 4)
3x + 6 > 4x + 8
3x + 6 - 4x > 8
3x - 4x > 8 - 6
- 1x > 2 ( DEVIDO ser (-1x) MUDA o simbolo
x < 2/-1
x < -2/1
x < - 2
6.
5X - ( X-2) < 6
5x - x + 2 < 6
4x + 2 < 6
4x < 6 - 2
4x < 4
x < 4/4
x < 1
7.
7 (X -2) < 2 (3X + 4)
7x - 14 < 6x + 8
7x - 14 - 6x < 8
7x - 6x < 8 + 14
1x < 22
x < 22/1
x < 22
8.
X+12 > 4 (2X -1) -3X
x + 12 > 8x - 4 - 3x
x + 12 > 8x - 3x - 4
x + 12 > 5x - 4
x + 12 - 5x > - 4
x - 5x > - 4 - 12
- 4x > -16 ( DEVIDO ser (-4x) MUDA simbolo
x < - 16/-4
x < + 16/4
x <
4
9.
2 (3X-1)-4 (X+2) <5X-1
6x - 2 - 4x - 8 < 5x - 1
6x - 4x - 2 - 8 < 5x - 1
2x - 10 < 5x - 1
2x - 10 - 5x <- 1
2x - 5x < - 1 + 10
- 3x < + 9 ( DEVIDO ser (-3x) MUDA o simbolo
x > 9/-3
x > - 9/3
x > - 3
10.
7 (3X-4) -4 (2X+3)> 2 (3X-5)
21x - 28 - 8x - 12 > 6x - 10
21x - 8x - 28 - 12 > 6x - 10
13x - 40 > 6x - 10
13x - 40 - 6x > - 10
13x - 6x > - 10 + 40
7x > 30
x > 30/7
11. X/2 +1 < 5/3 - x
x 5
---- + 1 < -------- - x SOMA com FRAÇÃO faz mmc = 2x3 = 6
2 3
3(x) + 6(1) < 2(5) - 6(x) fração com desigualdade(<) despreza o
------------------------------ denominador
6
3(x) + 6(1) < 2(5) - 6(x)
3x + 6 < 10 - 6x
3x + 6 + 6x < 10
3x + 6x < 10 - 6
9x < 4
x < 4/9
12.
2+ 3X/5 < X + 1/2
2 + 3x x + 1
--------- < ----------- FRAÇÃO < FRAÇÃO ( só cruzar)
5 2
2(2 + 3x) < 5(x + 1)
4 + 6x < 5x + 5
4 + 6x - 5x < 5
4 + 1x < 5
1x < 5 - 4
1x < 1
x < 1/1
x < 1
13.
X - 1/3 > X/2 - 1/2 (DIVISÕES)
x - 1 x 1
------ > ------- - ----- mmc 3x2 = 6
3 2 2
2(x - 1) > 3(x) - 3(1) instrução acima
-------------------------------
6
2(x - 1) > 3(x) - 3(1)
2x - 2 > 3x - 3
2x - 2 - 3x > - 3
2x - 3x > - 3 + 2
- 1x > - 1 atençã0 (-1x) acima
x < - 1/1
x < - 1
14.X/4 - 3/5 > X/10 - 1/2 mmc 4,5,10,2| 2
2,5, 5,1| 2
1,5,5,1 | 5
x 3 x 1 1,1,1,1/ = 2x2x5 = 20
---- - -------> ------ - ------
4 5 10 2
5(x) - 4(3) > 2(x) - 10(1)
--------------------------------------- idem acima
20
5(x) - 4(3) > 2(x) - 10(1)
5x - 12 > 2x - 10
5x - 12 - 2x > -10
5x - 2x > -10 + 12
3x > 2
x > 2/3
15.X+ 2/10 -1 < 1-X/4 10,4| 2
5,2| 2
2 x 5,1| 5
x + ------ - 1 < 1 - --------- 1,1/ = 2x2x5 = 20
10 4
20(x) + 2(2) - 20(1) < 20(1) - 5(x)
---------------------------------------------- idem
20
20(x) + 2(2) - 20(1) < 20(1) - 5(x)
20x + 4 - 20 < 20 - 5x
20x - 16 < 20 - 5x
20x - 16 + 5x < 20
20x + 5x < 20 + 16
25x < 36
x < 36/25
16. X/5 > 1/4 - 2-X/2
x 1 2 - x
--- > ----- - --------
5 4 2 mmc IGUAL acima =20
4(x) > 5(1) - 10(2 - x) idem acima
---------------------------
20
4(x) > 5(1) - 10(2 - x)
4x > 5 - 20 - 10x
4x > - 15 - 10x
4x + 10x > - 15
14x > - 15
x > - 15/14
17. X/8 - 3/16 > X/24 - 2/3 8.16.24.3| 2
4, 8,12,3| 2
2,4, 6,3| 2
x 3 x 2 1,2,3,3| 2
---- - ------- > ------ - -------- 1,1,3,3| 3
8 16 24 3 1,1,1,1/ = 2x2x2x2x3 = 48
6(x) - 3(3) > 2(x) - 16(2)
------------------------------------- idem acima
48
6(x) - 3(3) > 2(x) - 16(2)
6x - 9 > 2x - 32
6x - 9 - 2x > - 32
6x - 2x >- 32 + 9
4x > -23
x > -23/4
18. 1/3 (X-2) - 3/5 < X/2 -1
1(x - 2) 3 x
---------- - ------ < ------- - 1 mmc = 3x5x2 = 30
3 5 2
10[1(x - 2)] - 6(3) < 15(x) - 30(1)
---------------------------------------------- idem
30
10[1(x - 2)] - 6(3) < 15(x) - 30(1)
10[x - 2] - 18 < 15x - 30
10x - 20 - 18 < 15x - 30
10x - 38 < 15x - 30
10x - 38 - 15x < - 30
10x -15x > -30 + 38
- 5x < 8 ( DEVIDO ser (-5x) muda simbolo
x > 8/-5
x > - 8/5
19. X-1/4 + X/6 - X-2/3 > 0
x - 1 x x - 2
-------- + ---- - -------- > 0 mmc = 24
4 6 2
6(x - 1) + 4(x) - 12(x - 2) > 24(0)
-------------------------------------------- idem
24
6(x - 1) + 4(x) - 12(x - 2) > 24(0)
6x - 6 + 4x - 12x + 24 > 0
6x + 4x - 12x - 6 + 24 > 0
10x - 12x + 18 > 0
- 2x + 18 > 0
- 2x > - 18 ( deivido ser (-2x) fica <
x < -18/-2
x < + 18/2
x < 9
20. 2 - 4X -1/9 < 1/3 + 2X -5/6
1 1 2x - 5
2 - 4x - ------ < ---- + ---------- mmc = 18
9 3 6
18(2) - 18(4x) - 2(1) < 6(1) + 3(2x - 5) idem
--------------------------------------------------
18
18(2) - 18(4x) - 2(1) < 6(1) + 3(2x - 5)
36 - 72x - 2 < 6 + 6x - 15
36 - 2 - 72x < 6 - 15 + 6x
34 - 72x < - 9 + 6x
34 - 72x - 6x < - 9
34 - 78x < - 9
- 78x < - 9 - 34
- 78x <- 43 ( -78x) muda (>)
x > - 43/-78
x > + 43/78
21 : X+6/3 - 2X+3/4 ????????????? FALTA o simbolo?????
x + 6 2x + 3
------
22. 3X -2/4 - 2X-1/5 - 1 < 7X-3/10
3x - 2 2x - 1 7x - 3
-------- - ------------ - 1 < ----------- mmc = 20
4 5 10
5(3x - 2) - 4(2x - 1) - 20(1) < 2(7x - 3) idem
---------------------------------------------------------
20
5(3x - 2) - 4(2x - 1) - 20(1) < 2(7x - 3)
15x - 10 - 8x + 4 - 20 < 14x - 6
15x - 8x - 10 + 4 - 20 < 14x - 6
7x - 26 < 14x - 6
7x - 26 - 14x < - 6
7x - 14x < - 6 + 26
- 7x < 20 ( devido ser (-7x) (>)
x > 20/7
(BARRAS ASSIM EX: 45/6 É DIVISÃO)
Mkse:
volto JÁ
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