LÍMITES
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LÍMITES
Determine cada uno de los siguientes límites si es que existen. Si no existen, justifíquelos:
1. x 0
2t 14lim
5t 35
2. 2
x 8
x 64lim
x 8
3. 2
x 2
x 3x 2lim
x 8
4. 2
2x 2
x x 2lim
x 3x 2
5. x 2lim
4
6. x 3
x 3lim
x 3
7. 2 2
h 4
2x h 2xh 25hlim
h 5
8. 2
3x 0
x 2xlim
x 3x
9. x 2
x 3lim
x 4
10. 2x 1
(x 2)(x 1)lim
x 6x 5
11. 2
x 2
x 3x 10lim
x 2
12. 2
2x 2
x 3x 2lim
x x 6
13. 2
x 7
x 5x 14lim
x 7
14. 2
x 4
x x 12lim
x 4
15. 2
x 2
x 7x 10lim
x 2
16. 2x 5
x 5lim
x 4x 5
17. 2
x 0
(x 2) 4lim
x
18. 2
2x 0
x xlim
x x
19. 2
2t 2
t t 2lim
t 3t 2
20. x 9
x 3lim
x 9
21. 2
2x 2
(x 2)(x 3x 5)lim
x 3x 2
22. 2
2x 3
x x 6lim
x 6x 8
23. 2
2x 2
x 3x 10lim
x 4
24. 2
2x 3
(x 3)lim
x 5x 6
25. 2
x 1
x 3x 4lim
x 1
26. 2
2x 6
2x 12xlim
x x 42
27. 2
2x 5
x 3x 10lim
x 2x 35
28. h 0
1 1
5 h 5limh
29. 3
x 0
x 1lim
x 1
30. h 0
h 4 2lim
h
31. x 0
3 x 3lim
x
32. h 0
5 h 5lim
h
33. x 4
5 x 1lim
2 x
34. 2 2
x 2lim (2x 6x 5)
35. x 0
xlim
| x |
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36. x 0
2 x 2 xlim
x
37. 2
x 2
x 2x 3lim
8x
38. 3
r 1
28 rlim
r
39. x 0
x 9 3lim
x
40. 2
x 4
3 25 xlim
x 4
41. x 1
1 xlim
x 1
42. x 0
x 2 2lim
x
43. 2
h 3
h h 1lim
h 6
44. x 0
2 4 xlim
3x
45. x 0
x 4 2lim
x
46. 3 4
3x 3
(2x 1) (x 5)lim
(x 3) 9 x
47. 2
x 3
x | x 3 |lim
x 3
48. 2
x 3
x | x 3 |lim
x 3
49. 3 2
x 3
10x xlim
x 3
50. x 0
lim
51. y 2
(y 1)(y 2)lim
y 1
52. 4
x 1
x 1lim
x 1
53. 2
2x 1
x 2x 3lim
x 2x 1
54. 2
x 7
3x 21lim
x x 42
55. 2
2x 3
9 xlim
2x 5x 7
56. x 5
5 xlim
x 5
57. 2
2 6x
x 6x 8lim
10x 10
58. 2
2x
2x 6x 3lim
8 3x 5x
59. 3 2
3x
3x 5x 7lim
5x 4x
60. x
xlim e 1
61. 2
3x
2x 3x 7lim
x 3
62. 2
2x
x xlim
x x
63. x
xx
12 2lim
6 2
64. 2x
2x 5lim
x x 1
65. 2 2
3x
6x x 7x 2lim
5x 2x 1
66. x x
x xx
e elim
e e
67. hlim 2h
68. 2h
x 2lim
x 2x 1
69. 4 2
4 3h
3x 2x 1lim
7x 6x x
70. 2
x
x 2x 2lim
x
71. 2 2
2 2x
x xlim
4x 4x
72. 2
2x
x 6x 5lim
3x 4
73. 3 2
2 3x
3x 4x 6x 5lim
3 x x 2x
74. 2
x
x 1lim
3x 1
75. 2 3
3t
1 t 2tlim
t 5t
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76. 2
2x
2 3xlim
2x 5x 7
77. 2
2 3x
x 3xlim
1 x x
78. 3
2x
xlim
sen 3x
79. 3 2
3x
2x 12x 18xlim
x x 12
80. h 0
sen2hlim
h
81. 2
2x
2cos x 1lim
sen x 1
82. 2
2x
sen 3xlim
x
83. x 0
3xlim
sen5x
84. y /2
senylim
cosy 1
85. 2
2x 0
xlim
sen 3x
86. x 0
xlim
sen4x
87. Dada la función:
3 28x 16x 1si x
x 2 2
1f(x) 3 si x
2
sen x 1si x
x 2
Calcular los siguientes límites:
a) x 0lim f(x)
b) 1
x2
lim f(x)
c) x 2
lim f(x)
d) xlim f(x)
88. Dada la función:
| x | xy
x
Calcular los límites
a) x 0
lim y
b) x 0
lim y
c) x 0lim y
89. 2
2x 3
x 4x 4lim
x 9x
90. x 0
x 16 4lim
x
91. x 1
lnxsen(x 1)lim
x 1
92. 3 4
4 3x
x 7xlim
3x 5x
93. 2 2
y A
1 1
A ylim
y A
94. x 0
sen3xlim
xcosx
95. 2
x
10x 5x 3lim
1 3x
96. 2
2x 2
(3x 4)lim
x x 2
97. 2
2x 2
4 xlim
x 3x 2
98. Dada la función:
2
2
x 1si x 0
x x 2
f(x) 3 si x 0
x 2si x 0
x 4
Evaluar lo límites
a) x 0lim f(x)
b) x 4lim f(x)
c) x 1lim f(x)
d) x 2lim f(x)
e) xlim f(x)
99. x 0
sen3xlim
sen2x
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100. 2x
4x 3lim
3x 5
101. 2
2x 5
x 25lim
x 10x 25
102. 2
x 3
25 x 4lim
x 3
103. 2
2x 3
2x 5x 3lim
3x x 24
104. x 0
x senxlim
3senx 3x
105. x
x
2xlim e
x 1
106. 2
x 4
2 xlim
(x 4)
107. Si n R y el
x 3
2x mlim n
x 3
Calcular mn
108. Determine si existen los límites en los
puntos 2,3 y 4
y
4
3
2
1
2 3 4x
109. En la gráfica siguiente:
y
x
2
1
1 2 4-1-2-3-4-5
-1
-2
-3
y = f(x)
Calcular:
x 5 x 2 x 3
lim f(x) lim f(x) lim f(x)
110. En el gráfico siguiente:
y
x
5
4
3
0
-3
ba
f
Determine:
x a x b
x a x b
lim f(x) lim f(x)
Elim f(x) lim f(x)