Ta có: \(G\left( {1;2} \right)\)
\(\begin{array}{l}a)G' = {T_{\overrightarrow v }}\left( G \right) \Rightarrow \left\{ \begin{array}{l}{x_{G'}} = 1 + 1 = 2\\{y_{G'}} = 2 + 1 = 3\end{array} \right.\\G'' = {Q_{\left( {O, - {{90}^0}} \right)}}\left( {G'} \right) \Rightarrow \left\{ \begin{array}{l}{x_{G''}} = 3\\{y_{G''}} = - 2\end{array} \right.\\b)G' = {Q_{\left( {O,{{90}^0}} \right)}}\left( G \right) \Rightarrow \left\{ \begin{array}{l}{x_{G'}} = - 2\\{y_{G'}} = 1\end{array} \right.\\G'' = {D_{Ox}}\left( {G'} \right) \Rightarrow \left\{ \begin{array}{l}{x_{G''}} = - 2\\{y_{G''}} = - 1\end{array} \right. \Rightarrow G''\left( { - 2; - 1} \right)\end{array}\)
