Giải hệ phương trình \(\left\{ \begin{array}{l}{x^2} - 5xy + x - 5{y^2} = 42\\7xy + 6{y^2} + 42 = x\end{array} \right.\)
A.\(\left( {-6; 6} \right);\,\,\left( { 7;-7} \right)\)
B.\(\left( {-6; 6} \right);\,\,\left( { - 7;7} \right)\)
C.\(\left( {6; - 6} \right);\,\,\left( { 7;-7} \right)\)
D.\(\left( {6; - 6} \right);\,\,\left( { - 7;7} \right)\)
A.\(\left( {-6; 6} \right);\,\,\left( { 7;-7} \right)\)
B.\(\left( {-6; 6} \right);\,\,\left( { - 7;7} \right)\)
C.\(\left( {6; - 6} \right);\,\,\left( { 7;-7} \right)\)
D.\(\left( {6; - 6} \right);\,\,\left( { - 7;7} \right)\)
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Hóa Học lớp 12
