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