Hệ phương trình \(\left\{ \matrix{x - y + 1 = 0 \hfill \cr 2{x^2} - xy + 3{y^2} + 7x - 12y + 5 = 0 \hfill \cr} \right.\) có cặp nghiệm (x;y) là:
A.\(\left( {x;y} \right) \in \left\{ {\left( {2;1} \right);\left( {0; - 1} \right)} \right\}\)
B.\(\left( {x;y} \right) \in \left\{ {\left( {1;2} \right);\left( {0; - 1} \right)} \right\}\)
C.\(\left( {x;y} \right) \in \left\{ {\left( {1;2} \right);\left( {- 1; 0} \right)} \right\}\)
D.\(\left( {x;y} \right) \in \left\{ {\left( {2;1} \right);\left( {- 1; 0} \right)} \right\}\)
A.\(\left( {x;y} \right) \in \left\{ {\left( {2;1} \right);\left( {0; - 1} \right)} \right\}\)
B.\(\left( {x;y} \right) \in \left\{ {\left( {1;2} \right);\left( {0; - 1} \right)} \right\}\)
C.\(\left( {x;y} \right) \in \left\{ {\left( {1;2} \right);\left( {- 1; 0} \right)} \right\}\)
D.\(\left( {x;y} \right) \in \left\{ {\left( {2;1} \right);\left( {- 1; 0} \right)} \right\}\)
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Hóa Học lớp 12
