一瓶可乐原来5元,节日一律打八折,现每瓶售价____元。
― ______ is it from your school to the bus stop?
― It's ten minutes ______.
已知函数 f(x)=ln(kx)+1x−k(k>0) .
(Ⅰ)求f(x)的单调区间;
(Ⅱ)对任意 x∈1k,2k ,都有xln(kx)﹣kx+1≤mx,求m的取值范围.