Với các giá trị nào của $m$ thì phương trình:
$mx^2 + x + m - 1 = 0$ có hai nghiệm thực phân biệt $x_1; x_2$ thỏa mãn: $\left| {\frac{1}{x_1} - \frac{1}{x_2}} \right|>1$
phương trình có hai nghiệm thực phân biệt :
$\Leftrightarrow  \begin{cases}m \neq  0 \\ \Delta=1-4m(m-1)>0 \end{cases} $$\Leftrightarrow\begin{cases} m\neq 0\\ 4m^2-4m-1<0\end{cases}\Leftrightarrow(I)\begin{cases} m\neq 0\\\frac{2-2\sqrt{2}}{4}<m<\frac{2+2\sqrt{2}}{4}\end{cases}$

Điều kiện : $|\frac{1}{x_1}-\frac{1}{x_2}  |>1\Leftrightarrow  \begin{cases}|x_2-x_1|>|x_1x_2| \\ x_1x_2\neq  0 \end{cases} $
$\Leftrightarrow  \begin{cases}(x_1+x_2)^2-4x_1x_2>(x_1x_2)^2 \\ m\neq  1 \end{cases} \Leftrightarrow  \begin{cases}\frac{1}{m^2}-4(\frac{m-1}{m} )> (\frac{m-1}{m} ) \\ m\neq   1\end{cases}^2 $

$\Leftrightarrow\begin{cases} 5m^2-6m<0\\ m\neq 1\end{cases}$


$\Leftrightarrow  \begin{cases}0<m<\frac{6}{5}  \\ m\neq  1 \end{cases} $

Kết hợp với $(I)$

Vậy  $m$ thỏa mãn
$\Leftrightarrow  0<m<1, 1<m<\frac{6}{5} $

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