题目内容
已知定义在(0,+∞)上的函数f(x)满足:对任意x∈(0,+∞),恒有f(2x)=2f(x)成立,当x∈(1,2]时,f(x)=2-x,给出如下四个结论:①对任意m∈N,有f(2m)=0;②函数f(x)的值域为[0,+∞);③存在n∈N,使得f(2n+1)=9;④“函数f(x)在区间(a,b)上单调递减”的充要条件是“存在k∈N,使得(a,b)
(2k,2k+1)”;则其中正确的结论是 ( )
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