Tập hợp \[A = \{ x \in \mathbb{N}|{\rm{ }}8 < x < 12\} \] là2/21Tập hợp \[A = \{ x \in \mathbb{N}|{\rm{ }}8 < x < 12\} \]là\[\left\{ {8\,;\,\,9\,;\,\,10\,;\,\,11} \right\}\].\[\left\{ {9\,;\,\,10\,;\,\,11\,;\,\,12} \right\}\].\[\left\{ {9\,;\,\,10\,;\,\,11} \right\}\].\[\left\{ {8\,;\,\,9\,;\,\,10\,;\,\,11\,;\,\,12} \right\}\].Giải thíchC. \[\left\{ {9\,;\,\,10\,;\,\,11} \right\}\].