Giải các hệ phương trình sau: \(\left\{ \begin{array}{l}\frac{4}{{x + y}} + \frac{1}{{y - 1}} = 5\\\frac{1}{{x + y}} - \frac{2}{{y - 1}} = - 1\end{array} \right.\)
A.\(\left( {x;\,\,y} \right) = \left( { 1;\,\,-2} \right).\)
B.\(\left( {x;\,\,y} \right) = \left( { 1;\,\,2} \right).\)
C.\(\left( {x;\,\,y} \right) = \left( { - 1;\,\,-2} \right).\)
D.\(\left( {x;\,\,y} \right) = \left( { - 1;\,\,2} \right).\)
A.\(\left( {x;\,\,y} \right) = \left( { 1;\,\,-2} \right).\)
B.\(\left( {x;\,\,y} \right) = \left( { 1;\,\,2} \right).\)
C.\(\left( {x;\,\,y} \right) = \left( { - 1;\,\,-2} \right).\)
D.\(\left( {x;\,\,y} \right) = \left( { - 1;\,\,2} \right).\)
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Hóa Học lớp 12
