Tìm tập xác định \({\rm{D}}\) của hàm số \(f\left( x \right) = \left\{ {\begin{array}{*{20}{l}}{\dfrac{1}{x}}&{;x \ge 1}\\{\sqrt {x + 1} }&{;x < 1}\end{array}} \right..\)

\( - 1 \le m \le 1\)

\(\dfrac{3}{2} \le m \le 2\)

\(0 \le m \le 2\)

\(0 \le m < \dfrac{3}{2}\)

\(\overrightarrow v  = \left( { - 1;2} \right)\)    

\(\overrightarrow v  = \left( {1; - 1} \right)\)

\(\overrightarrow v  = \left( {1;1} \right)\)      

\(\overrightarrow v  = \left( {1;0} \right)\)

\({M_1}\left( {2;1} \right)\).

\({M_2}\left( {1;1} \right).\)

\({M_3}\left( {2;0} \right).\)

\({M_4}\left( {0; - 2} \right).\)

\(A\left( {2;0} \right).\)

\(B\left( {3;\dfrac{1}{3}} \right).\)

\(C\left( {1; - 1} \right).\)

\(D\left( { - 1; - 3} \right).\)

\(f\left( { - 1} \right) = 5.\)

\(f\left( 2 \right) = 10.\)

\(f\left( { - 2} \right) = 10.\)

\(f\left( {\dfrac{1}{5}} \right) =  - 1.\)

\({\rm{D}} = \mathbb{R}.\)

\({\rm{D}} = \left( {1; + \infty } \right).\)

\({\rm{D}} = \mathbb{R}\backslash \left\{ 1 \right\}.\)

\({\rm{D}} = \left[ {1; + \infty } \right).\)