Giải hệ phương trình \(\left\{ \begin{array}{l}x\left( {x - 3y} \right) + y\left( {y + x} \right) = 0\\\sqrt x .\sqrt {y - 2} = 1\end{array} \right.\)
A.\(\left( {x;\,\,y} \right) \in \left\{ {\left( {\sqrt 2 + 1;\,\,\sqrt 2 + 1} \right),\left( { - \sqrt 2 + 1;\,\, - \sqrt 2 + 1} \right)} \right\}.\)
B.\(\left( {x;\,\,y} \right) \in \left\{ {\left( {\sqrt 2 - 1;\,\,\sqrt 2 - 1} \right),\left( { - \sqrt 2 + 1;\,\, - \sqrt 2 + 1} \right)} \right\}.\)
C.\(\left( {x;\,\,y} \right) \in \left\{ {\left( {\sqrt 2 - 1;\,\,\sqrt 2 - 1} \right),\left( {\sqrt 2 + 1;\,\,\sqrt 2 + 1} \right)} \right\}.\)
D.\(\left( {x;\,\,y} \right) \in \left\{ {\left( {\sqrt 2 + 1;\,\,\sqrt 2 + 1} \right),\left( { - \sqrt 2 - 1;\,\, - \sqrt 2 - 1} \right)} \right\}.\)
A.\(\left( {x;\,\,y} \right) \in \left\{ {\left( {\sqrt 2 + 1;\,\,\sqrt 2 + 1} \right),\left( { - \sqrt 2 + 1;\,\, - \sqrt 2 + 1} \right)} \right\}.\)
B.\(\left( {x;\,\,y} \right) \in \left\{ {\left( {\sqrt 2 - 1;\,\,\sqrt 2 - 1} \right),\left( { - \sqrt 2 + 1;\,\, - \sqrt 2 + 1} \right)} \right\}.\)
C.\(\left( {x;\,\,y} \right) \in \left\{ {\left( {\sqrt 2 - 1;\,\,\sqrt 2 - 1} \right),\left( {\sqrt 2 + 1;\,\,\sqrt 2 + 1} \right)} \right\}.\)
D.\(\left( {x;\,\,y} \right) \in \left\{ {\left( {\sqrt 2 + 1;\,\,\sqrt 2 + 1} \right),\left( { - \sqrt 2 - 1;\,\, - \sqrt 2 - 1} \right)} \right\}.\)
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Hóa Học lớp 12
