Cho hàm số:$f(x) = \left\{ \begin{array}{l}\dfrac{x}{{x + 1}},{\rm{ }}x \ge 0\\\dfrac{1}{{x - 1}},{\rm{ }}x < 0\end{array} \right.$. Giá trị $f\left( 0 \right),f\left( 2 \right),f\left( { - 2} \right)$ là

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

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

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

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

$4$

$3$

$2$

$1$

\(IA = IB.\)

\(\overrightarrow {IA}  + \overrightarrow {IB}  = \overrightarrow 0 .\)

\(\overrightarrow {IA}  - \overrightarrow {IB}  = \overrightarrow 0 .\)

\(\overrightarrow {IA}  = \overrightarrow {IB} .\)

$0$

$1$

$2$

Kết quả khác

\(7 \subset {\mathbb{N}^*}\)

\(7 \in {\mathbb{N}^*}.\)

\(7 < {\mathbb{N}^*}.\)

\(7 \notin {\mathbb{N}^*}\)

Hình 1.

Hình 2

Hình 3

Hình 4