Câu hỏi 24

\(\left\{ \begin{array}{l}{V_{\left( {I; - 2} \right)}}\\I\left( {1;3} \right)\\A'\left( {1;2} \right)\end{array} \right.\)

Qua \({V_{\left( {I; - 2} \right)}}\) biến \(A\) thành \(A'\)

\(\begin{array}{l} \Rightarrow \overrightarrow {IA'}  = k\overrightarrow {IA}  \Leftrightarrow \left( {0; - 1} \right) =  - 2\left( {x - 1;y - 3} \right)\\ \Leftrightarrow \left\{ \begin{array}{l}x = 1\\y = \dfrac{7}{2}\end{array} \right. \Rightarrow A\left( {1;\dfrac{7}{2}} \right).\end{array}\)

Chọn B.