D=Ry'=x2m−2x+m(mx−1)2De hs ko co cuc tri thi y'=0 co nghiem kep hoac vnSuy ra x2m-2x+m=0⇔Δ'≤0Suy ra 1-m2≤0$
D=Ry'=
x2m−2x+m(mx−1)2De hs ko co cuc tri thi y'=0 co nghiem kep hoac vnSuy ra
x2m-2x+m=0
⇔Δ'
≤0Suy ra 1-
m2≤0
Suy ra m$
\leq−1hoacm\geq$1