Questão referente ao Texto-base -
Conjuntos numéricos O uso de intervalo de conjuntos é muito comum na solução de situações problemas. Analise as sentenças abaixo e assinale a verdadeira:
straight O space intervalo space aberto space left curly bracket straight x element of straight real numbers space divided by space straight a less than straight x less than straight b right curly bracket space pode space ser space escrito space como left parenthesis straight a comma straight b right parenthesis.
straight O space intervalo space fechado space left curly bracket straight x space element of straight real numbers space vertical line space straight a less or equal than straight x less or equal than straight b right curly bracket space pode space ser space escrito space como space left square bracket straight a comma straight b left square bracket.
straight O space intervalo space infinito space left curly bracket straight x space element of straight real numbers space vertical line space straight x greater than straight a right curly bracket space pode space ser space escrito space como space left parenthesis straight a comma plus infinity right square bracket.
straight O space intervalo space infinito space left curly bracket straight x element of straight real numbers space vertical line space straight x less than straight a right curly bracket space pode space ser space escrito space como left parenthesis straight a comma negative infinity right square bracket.
straight O space intervalo space aberto space straight à space direita space straight e space fechado space straight à space esquerda space left curly bracket straight x element of straight real numbers space vertical line space straight a less or equal than straight x less than straight b right curly bracket space pode space ser space escrito space como space right square bracket straight a comma space plus infinity left square bracket.
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