Giải hệ bất phương trình sau : \(\left\{ \begin{array}{l}\left| x \right| + \left| y \right| \le 1\\{\left| x \right|^2} + {\left| y \right|^2} \ge 1\end{array} \right.\)
A.\(\left( {x;y} \right) = \left\{ {\left( {0;1} \right),\left( {0; - 1} \right),\left( { - 1;0} \right),\left( {1;0} \right)} \right\}\)
B.\(\left( {x;y} \right) = \left\{ {\left( {0;1} \right),\left( {0; - 1} \right),\left( {1;0} \right)} \right\}\)
C.\(\left( {x;y} \right) = \left\{ {\left( {0;1} \right) ,\left( { - 1;0} \right),\left( {1;0} \right)} \right\}\)
D.\(\left( {x;y} \right) = \left\{ {\left( {0;1} \right),\left( {1;0} \right)} \right\}\)
A.\(\left( {x;y} \right) = \left\{ {\left( {0;1} \right),\left( {0; - 1} \right),\left( { - 1;0} \right),\left( {1;0} \right)} \right\}\)
B.\(\left( {x;y} \right) = \left\{ {\left( {0;1} \right),\left( {0; - 1} \right),\left( {1;0} \right)} \right\}\)
C.\(\left( {x;y} \right) = \left\{ {\left( {0;1} \right) ,\left( { - 1;0} \right),\left( {1;0} \right)} \right\}\)
D.\(\left( {x;y} \right) = \left\{ {\left( {0;1} \right),\left( {1;0} \right)} \right\}\)
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Hóa Học lớp 12
