D=Ry'=$\frac{x^{2}m-2x+m}{(mx-1)^{2}}$De hs ko co cuc tri thi y'=0 co nghiem kep hoac vnSuy ra $x^{2}$m-2x+m=0$\Leftrightarrow$$\Delta$'$\leq$0Suy ra 1-$m^{2}$$\leq$0Suy ra m$\leq$-1 hoac m$\geq$1
D=Ry'=$\frac{x^{2}m-2x+m}{(mx-1)^{2}}$De hs ko co cuc tri thi y'=0 co nghiem kep hoac vnSuy ra $x^{2}$m-2x+m=0$\Leftrightarrow$$\Delta$'$\leq$0Suy ra 1-$m^{2}$$\leq$0$
D=Ry'=$\frac{x^{2}m-2x+m}{(mx-1)^{2}}$De hs ko co cuc tri thi y'=0 co nghiem kep hoac vnSuy ra $x^{2}$m-2x+m=0$\Leftrightarrow$$\Delta$'$\leq$0Suy ra 1-$m^{2}$$\leq$0
Suy ra m$
\leq$-1 hoac m$\geq$1