已知函数
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.
(1)求函数f(x)的定义域;(2)用函数单调性定义证明f(x)在(2,+∞)上是增函数.
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(2)log
2.56.25+lg
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+ln(
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)+log
2(log
216)
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已知全集为R,集合A={x||x-1|<4},集合B={x|x
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2-kx-8在区间[5,20]上有单调性,求参数k的取值范围.
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