已知函数f(x)=
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-kx且f(x)在区间(2,+∞)上为增函数.
(1)求k的取值范围;
(2)若函数f(x)与g(x)的图象有三个不同的交点,求实数k的取值范围.
考点分析:
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f(x)对任意x∈R都有
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.
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和
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的值;
(Ⅱ)数列{a
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![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101223756882584518/SYS201311012237568825845019_ST/3.png)
,数列{a
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(Ⅲ)令
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.试比较T
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在三棱柱ABC-A
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,设D为CC
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在△ABC中,角A、B、C所对的边分别为a、b、c,已知向量
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101223756882584518/SYS201311012237568825845017_ST/0.png)
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⊥
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101223756882584518/SYS201311012237568825845017_ST/3.png)
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![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101223756882584518/SYS201311012237568825845017_ST/4.png)
=4,求边BC的最小值.
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不等式
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101223756882584518/SYS201311012237568825845016_ST/0.png)
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.
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