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PT có 2 nghiệm tm $x_1<x_2<1$

\Leftrightarrow $\left\{\begin{matrix}m-1 \neq 0 & \\\Delta '>0 & \\ (x_1-1)(x_2-1)> 0& \\x_1-1+x_2-1<0& \end{matrix}\right.$

$\left\{\begin{matrix}m \neq 1 & \\2-m>0 & \\ \dfrac{1}{m-1}+\dfrac{2}{m-1}+1> 0& \\\dfrac{-2}{m-1}<2& \end{matrix}\right.$
 
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