(1)当时,求的单调区间;
(2)若在区间上单调递增,求的取值范围.
(Ⅰ)若f(x)在x=x1 , x2(x1≠x2)处导数相等,证明:f(x1)+f(x2)>8−8ln2;
(Ⅱ)若a≤3−4ln2,证明:对于任意k>0,直线y=kx+a与曲线y=f(x)有唯一公共点.
(Ⅰ)求曲线y=f(x)在点(π,f(π))处的切线方程;
(Ⅱ)令h(x)=g (x)﹣a f(x)(a∈R),讨论h(x)的单调性并判断有无极值,有极值时求出极值.
(Ⅰ)若 f(x)≥0,求a的值;
(Ⅱ)设m为整数,且对于任意正整数n,(1+ )(1+ )…(1+ )<m,求m的最小值.