⑴ 当$m\le 0$时,$f\left( x \right)$在$\left( 0\ \ \ +\infty \right)$单调递减;
当$0<m<1$时,$f\left( x \right)$在$\left( 0\ \ \ \frac{m}{1-m} \right)$单调递增,$f\left( x \right)$在$\left( \frac{m}{1-m}\ \ \ +\infty \right)$单调递减;
当$m\ge 1$时,$f\left( x \right)$在$\left( 0\ \ \ +\infty \right)$单调递增.
(2)
当$a<0$时,$f(x)$的单调递增区间为$\left( \frac{1}{a}\ \ \ 1 \right)$,单调递减区间为$\left( -\infty \ \ \ \frac{1}{a} \right)$与$(1\ \ \ +\infty )$;
当$a=0$时,$f(x)$的单调递增区间为$(-\infty \ \ \ 1)$,单调递减区间为$(1\ \ \ +\infty )$;
当$0<a<1$时,$f(x)$的单调递增区间为$\left( -\infty \ \ \ 1 \right)$与$\left( \frac{1}{a}\ \ \ +\infty \right)$;单调递减区间为$\left( 1\ \ \ \frac{1}{a} \right)$.
当$a=1$时,$f(x)$的单调递增区间为$\left( -\infty \ \ \ +\infty \right)$;
当$a>1$时,$f(x)$的单调递增区间为$\left( -\infty \ \ \ \frac{1}{a} \right)$与$\left( 1\ \ \ +\infty \right)$;单调递减区间为$\left( \frac{1}{a}\ \ \ 1 \right)$.
⑴ 当$m\le 0$时,$f\left( x \right)$在$\left( 0\ \ \ +\infty \right)$单调递减;
当$0<m<1$时,$f\left( x \right)$在$\left( 0\ \ \ \frac{m}{1-m} \right)$单调递增,$f\left( x \right)$在$\left( \frac{m}{1-m}\ \ \ +\infty \right)$单调递减;
当$m\ge 1$时,$f\left( x \right)$在$\left( 0\ \ \ +\infty \right)$单调递增.
(2)