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“DESIGUALDAD”
Resolver una desigualdad es encontrar el conjunto de los números reales que la hacen verdadera en contraste con una ecuación, cuyo conjunto solución consta de un solo número el conjunto solución de una desigualdad consta de un intervalo completo de números o en algunos casos la unión de algunos casos la unión de varios intervalos.
Intervalos
La doble desigualdad describe un intervalo abierto ( a< x < b ) que consiste en todos los números comprendidos entre a y b sin incluir los extremos a y b la designaremos mediante el símbolo:
La desigualdad a xb describe a un intervalo cerrado que si incluye los extremos a y b y se denota así:
Nota : Observar forma de paréntesis
TIPS
Los paréntesis redondos ( ), no entran extremos
Con los paréntesis cuadrados [ ], sí entran los extremos
La flecha indica infinito
Notación de conjuntos
Notación de intervalos
Gráfica
x: a < x < b
(a, b)
x: a x b
[a , b]
x: a x < b
[a , b)
x : a < x b
(a , b]
x : x b
(- , b ]
x : x < b
(- , b )
x : x a
[a , )
x : x > a
(a , )
R
(- , )
Ejercicio:
Dibujar cada uno de los siguientes intervalos en la recta numérica.
Notación de conjuntos
a) (-4 , 1)
b) [0 , 6)
c) [7 , )
d) [-7 , 2]
e) [-3 , 5)
f) (- , -2]
Escribe en notación de conjuntos e intervalos
Notación conjunto Notación intervalos
(2, 7)
[-3 , 4)
(- , -2)
(-4 , )
[-1 , 3 ]
Encontrar valor absoluto de
Escribir > ó < = entre los dos valores para que sea positivo positivo
|-4|=4
|5/3|=5/3
|-8|=8
|0|=0
|-3| = |3|
|-3| < |-4|
|6| < |8|
-|4| < |-3|
-|-6| < |-5|
|6| = |-6|
|9| > |3|
|-16| > |-5|
|-9| < |3|
-4 = -|4|
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Enviado por: Luis David Idioma: castellanoPaís: México