Tìm các số thực \(x,\,\,y,\,\,z\) thỏa mãn các điều kiện sau:
\(\left\{ \begin{array}{l}0 < x,\,\,y,\,\,z \le 1\\\dfrac{x}{{1 + y + zx}} + \dfrac{y}{{1 + z + xy}} + \dfrac{z}{{1 + x + yz}} = \dfrac{3}{{x + y + z}}\end{array} \right..\)
A.\(\left ( x;y;z \right ) = \left ( - 1; - 1; - 1 \right )\)
B.\(\left ( x;y;z \right ) = \left ( 2;2;2 \right )\)
C.\(\left( {x;y;z} \right) = \left( {1;1;1} \right)\)
D.\(\left ( x;y;z \right ) = \left ( - 2; - 2; - 2 \right )\)
\(\left\{ \begin{array}{l}0 < x,\,\,y,\,\,z \le 1\\\dfrac{x}{{1 + y + zx}} + \dfrac{y}{{1 + z + xy}} + \dfrac{z}{{1 + x + yz}} = \dfrac{3}{{x + y + z}}\end{array} \right..\)
A.\(\left ( x;y;z \right ) = \left ( - 1; - 1; - 1 \right )\)
B.\(\left ( x;y;z \right ) = \left ( 2;2;2 \right )\)
C.\(\left( {x;y;z} \right) = \left( {1;1;1} \right)\)
D.\(\left ( x;y;z \right ) = \left ( - 2; - 2; - 2 \right )\)
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Hóa Học lớp 12
