Xét tính chẵn lẻ của hàm số $f(x) = \left\{ {\begin{array}{*{20}{c}}{ - 1\,\,\,Khi\,\,x < 0}\\{0\,\,\,\,Khi\,\,x = 0}\\{1\,\,\,\,Khi\,\,x > 0}\end{array}} \right.$

${\rm{D}} = \left\{ {2;\dfrac{{ - 3 - \sqrt 5 }}{2};\dfrac{{ - 3 + \sqrt 5 }}{2}} \right\}$

${\rm{D}} = \mathbb{R}\backslash \left\{ { - 2;\dfrac{{ - 3 - 2\sqrt 5 }}{2};\dfrac{{ - 3 + 2\sqrt 5 }}{2}} \right\}$

${\rm{D}} = \mathbb{R}\backslash \left\{ {\dfrac{{ - 3 - \sqrt 5 }}{2};\dfrac{{ - 3 + \sqrt 5 }}{2}} \right\}$

${\rm{D}} = \mathbb{R}\backslash \left\{ {2;\dfrac{{ - 3 - \sqrt 5 }}{2};\dfrac{{ - 3 + \sqrt 5 }}{2}} \right\}$

${\rm{D}} = \mathbb{R}\backslash \left\{ {0;2} \right\}$

${\rm{D}} = \left[ { - 2; + \infty } \right)$

${\rm{D}} = \left( { - 2; + \infty } \right)\backslash \left\{ {0;2} \right\}$

${\rm{D}} = \left[ { - 2; + \infty } \right)\backslash \left\{ {0;2} \right\}$

$D = \left[ { - 1; + \infty } \right)\backslash \left\{ 0 \right\}$

${\rm{D}} = \mathbb{R}$  

${\rm{D}} = \left[ { - 1; + \infty } \right)$

${\rm{D}} = \left[ { - 1;1} \right)$

$m \in \left( { - \infty ;\dfrac{3}{2}} \right] \cup \left\{ 2 \right\}$

$m \in \left( { - \infty ; - 1} \right] \cup \left\{ 2 \right\}$

$m \in \left( { - \infty ;1} \right] \cup \left\{ 3 \right\}$

$m \in \left( { - \infty ;1} \right] \cup \left\{ 2 \right\}$

hàm số lẻ

hàm số chẵn   

không xét được tính chẵn lẻ

hàm số không chẵn, không lẻ

$m = 0$

$m =  \pm 3$

$m =  \pm 1$

$m =  \pm 2$