Tìm \(m\) để phương trình \(m{x^2} + \left( {{m^2} - 3} \right)x + m = 0\,\) có hai nghiệm phân biệt \({x_1},\,\,{x_2}\) thỏa mãn \({x_1} + {x_2} = \frac{{13}}{4}\).
A.\(\left[ \begin{array}{l}m = \frac{3}{4}\\m = 4\end{array} \right.\)
B.\(\left[ \begin{array}{l}m = - \frac{3}{4}\\m = 4\end{array} \right.\)
C.\(\left[ \begin{array}{l}m = - \frac{3}{4}\\m = - 4\end{array} \right.\)
D.\(\left[ \begin{array}{l}m = \frac{3}{4}\\m = - 4\end{array} \right.\)
A.\(\left[ \begin{array}{l}m = \frac{3}{4}\\m = 4\end{array} \right.\)
B.\(\left[ \begin{array}{l}m = - \frac{3}{4}\\m = 4\end{array} \right.\)
C.\(\left[ \begin{array}{l}m = - \frac{3}{4}\\m = - 4\end{array} \right.\)
D.\(\left[ \begin{array}{l}m = \frac{3}{4}\\m = - 4\end{array} \right.\)
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