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某汽车厂有一条价值为a万元的汽车生产线,现要通过技术改造来提高该生产线的生产能力...
某汽车厂有一条价值为a万元的汽车生产线,现要通过技术改造来提高该生产线的生产能力,提高产品的增加值,经过市场调查,产品的增加值y万元与技术改造投入x万元之间满足:①y与(a-x)•x
2成正比;②当
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时,y=a
3,并且技术改造投入满足
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024182835195600465/SYS201310241828351956004014_ST/1.png)
,其中t为常数且t∈(1,2].则函数y=f(x)表达式为
,定义域
.
考点分析:
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给出下列四个结论:
①函数y=a
x(a>0且a≠1)与函数y=log
aa
x(a>0且a≠1)的定义域相同;
②函数y=
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是奇函数;
③函数y=sin(-x)在区间[
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]上是减函数;
④函数y=cos|x|是周期函数.
其中正确结论的序号是
.(填写你认为正确的所有结论序号)
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如图,在△ABC中,设
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,
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,AP的中点为Q,BQ的中点为R,CR的中点为P,若
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,则m+n=
.
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已知向量
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024182835195600465/SYS201310241828351956004011_ST/0.png)
且a
1=1,若数列{a
n}的前n项和为S
n,且
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=λ
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024182835195600465/SYS201310241828351956004011_ST/2.png)
(λ∈R,λ≠0),则
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024182835195600465/SYS201310241828351956004011_ST/3.png)
=
.
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已知f(x)是定义在R上的且以2为周期的偶函数,当0≤x≤1时,f(x)=x
2,如果直线y=x+a与曲线y=f(x)恰有两个不同的交点,则实数a的值为( )
A.2k(k∈Z)
B.2k或2k+
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(k∈Z)
C.0
D.2k或2k-
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(k∈Z)
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