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设k∈R,函数f(x)=lnx﹣kx. (1)若k=2,y=f(x)极大值; (2)若f(x)无零点,求实数k的取值范围; (3)若f(x)有两个相异零点x1,x2,求证:lnx1+lnx2>...
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高二下学期数学《2017-2018学年河北省邯郸市高二(下)期末数学试卷》真题及答案
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