Giải hệ phương trình : \( \left \{ \begin{array}{l} \dfrac{1}{{{x^2}}} + \dfrac{2}{{{y^2}}} = 3 \ \ \dfrac{4}{{{x^2}}} + \dfrac{6}{{{y^2}}} = 10 \end{array} \right. \)
A.Vô nghiệm
B.\(\left( { - 1;1} \right),\left( {1;1} \right);\left( {1; - 1} \right);\left( { - 1; - 1} \right).\)
C.\(\left( { - 1;1} \right);\left( {1; - 1} \right);\left( { - 1; - 1} \right).\)
D.\(\left( { - 1;1} \right),\left( {1;1} \right).\)
A.Vô nghiệm
B.\(\left( { - 1;1} \right),\left( {1;1} \right);\left( {1; - 1} \right);\left( { - 1; - 1} \right).\)
C.\(\left( { - 1;1} \right);\left( {1; - 1} \right);\left( { - 1; - 1} \right).\)
D.\(\left( { - 1;1} \right),\left( {1;1} \right).\)
Loga
Hóa Học lớp 12
