Giải các phương trình và hệ phương trình sau:
a) \({x^2} - 3x + 2 = 0\) b) \({x^2} - 2\sqrt 3 x + 3 = 0\)
c) \({x^4} - 9{x^2} = 0\) d) \(\left\{ \begin{array}{l}x - y = 3\\3x - 2y = 8\end{array} \right.\)
A.\(\begin{array}{l}a)\,S = \left\{ {1;\,2} \right\}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,b)\,S = \left\{ {\sqrt 3 } \right\}\\c)\,\,S = \left\{ { - 3;\,\,0;\,\,3} \right\}\,\,\,\,\,\,d)\,S = \left\{ {2;\, - 1} \right\}\end{array}\)
B.\(\begin{array}{l}a)\,S = \left\{ { - 1;\, - 2} \right\}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,b)\,S = \left\{ {\sqrt 3 } \right\}\\c)\,\,S = \left\{ {0;\,\,3} \right\}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,d)\,S = \left\{ {2;\, - 1} \right\}\end{array}\)
C.\(\begin{array}{l}a)\,S = \left\{ {1;\,2} \right\}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,b)\,S = \left\{ { - \sqrt 3 } \right\}\\c)\,\,S = \left\{ { - 3;\,\,0;\,\,3} \right\}\,\,\,\,\,\,d)\,S = \left\{ { - 2;\,1} \right\}\end{array}\)
D.\(\begin{array}{l}a)\,S = \left\{ { - 1; - \,2} \right\}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,b)\,S = \left\{ {\sqrt 3 } \right\}\\c)\,\,S = \left\{ { - 3;\,\,0;\,\,3} \right\}\,\,\,\,\,\,\,\,\,\,\,\,\,d)\,S = \left\{ { - 2;\,1} \right\}\end{array}\)
a) \({x^2} - 3x + 2 = 0\) b) \({x^2} - 2\sqrt 3 x + 3 = 0\)
c) \({x^4} - 9{x^2} = 0\) d) \(\left\{ \begin{array}{l}x - y = 3\\3x - 2y = 8\end{array} \right.\)
A.\(\begin{array}{l}a)\,S = \left\{ {1;\,2} \right\}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,b)\,S = \left\{ {\sqrt 3 } \right\}\\c)\,\,S = \left\{ { - 3;\,\,0;\,\,3} \right\}\,\,\,\,\,\,d)\,S = \left\{ {2;\, - 1} \right\}\end{array}\)
B.\(\begin{array}{l}a)\,S = \left\{ { - 1;\, - 2} \right\}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,b)\,S = \left\{ {\sqrt 3 } \right\}\\c)\,\,S = \left\{ {0;\,\,3} \right\}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,d)\,S = \left\{ {2;\, - 1} \right\}\end{array}\)
C.\(\begin{array}{l}a)\,S = \left\{ {1;\,2} \right\}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,b)\,S = \left\{ { - \sqrt 3 } \right\}\\c)\,\,S = \left\{ { - 3;\,\,0;\,\,3} \right\}\,\,\,\,\,\,d)\,S = \left\{ { - 2;\,1} \right\}\end{array}\)
D.\(\begin{array}{l}a)\,S = \left\{ { - 1; - \,2} \right\}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,b)\,S = \left\{ {\sqrt 3 } \right\}\\c)\,\,S = \left\{ { - 3;\,\,0;\,\,3} \right\}\,\,\,\,\,\,\,\,\,\,\,\,\,d)\,S = \left\{ { - 2;\,1} \right\}\end{array}\)
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