已知f(x)=lg(ax-bx)(a,b为常数), ①当a,b>0且a≠b时,求 发布时间:2017-05-03 22:22 │ 来源:www.tikuol.com 题型:解答题 问题: 已知f(x)=lg(ax-bx)(a,b为常数),①当a,b>0且a≠b时,求f(x)的定义域;②当a>1>b>0时,判断f(x)在定义域上的单调性,并用定义证明.
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