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设集合A={x|x2-a<0},B={x|x<2},若A∩B=A,则实数a的取值...
设集合A={x|x2-a<0},B={x|x<2},若A∩B=A,则实数a的取值范围是 .
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函数f(x)=
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(0<x<1)的反函数为f
-1(x),数列{a
n}和{b
n}满足:
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,a
n+1=f
-1(a
n),函数y=f
-1(x),的图象在点(n,f
-1(n))(n∈N
*)处的切线在y轴上的截距为b
n.
(1)求数列{a
n}的通项公式;
(2)若数列{
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-
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}的项中仅
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最小,求λ的取值范围;
(3)令函数g(x)=[f
-1(x)+f(x)]-
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,0<x<1.数列{x
n}满足:x
1=
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,0<x
n<1且x
n+1=g(x
n)(其中n∈N
*).证明:
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+
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+…+
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<
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.
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在双曲线
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中,F为右焦点,B为左顶点.点A在x轴正半轴上,且满足|OA|,|OB|,|OF|成等比数列.过F作C位于一、三象限内的渐近线的垂线,垂足为P.
(1)求证:
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;
(2)若
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,
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,过点(0,-2)的直线l与双曲线C交于不同两点M与N,O为坐标原点.求
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的取值范围.
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已知函数f(x)=alnx-ax-3(a∈R)
(1)求f(x)的单调区间;
(2)若函数f(x)的图象在点(2,f)处切线的倾斜角为45°,且对于任意的t∈[1,2],函数
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已知数列{a
n}满足:
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183014176782512/SYS201310241830141767825017_ST/0.png)
(1)设
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,求数列{b
n}的通项公式;
(2)若对任意给定的正整数m,使得不等式a
n+t≥2m(n∈N
*)成立的所有n中的最小值为m+2,求实数t的取值范围.
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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
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=(c-2b,a),
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=(cosA,cosC)且
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⊥
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.
(1)求角A的大小;
(2)若
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