Giải hệ phương trình: \(\left\{ \begin{array}{l}3x - y = 3\\2x + y = 7\end{array} \right..\)
A.\(\left( {x;\,\,y} \right) = \left( {2;\,\,3} \right).\)
B.\(\left( {x;\,\,y} \right) = \left( {1;\,\,2} \right).\)
C.\(\left( {x;\,\,y} \right) = \left( {1;\,\,3} \right).\)
D.\(\left( {x;\,\,y} \right) = \left( {2;\,\,1} \right).\)
A.\(\left( {x;\,\,y} \right) = \left( {2;\,\,3} \right).\)
B.\(\left( {x;\,\,y} \right) = \left( {1;\,\,2} \right).\)
C.\(\left( {x;\,\,y} \right) = \left( {1;\,\,3} \right).\)
D.\(\left( {x;\,\,y} \right) = \left( {2;\,\,1} \right).\)
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Hóa Học lớp 12
