(1+x2)(1-x)5展开式中x3的系数为 .
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在整数集Z中,被5除所得余数为k的所有整数组成一个“类”,记为[k],即[k]={5n+k丨n∈Z},k=0,1,2,3,4.给出如下四个结论:
①2011∈[1];
②-3∈[3];
③Z=[0]∪[1]∪[2]∪[3]∪[4];
④“整数a,b属于同一“类”的充要条件是“a-b∈[0]”.
其中,正确结论的个数是( )
A.1
B.2
C.3
D.4
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已知函数
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123733327796320/SYS201310251237333277963010_ST/0.png)
,且关于x的方程f(x)+x-a=0有且只有一个实根,则实数a的范围是( )
A.(-∞,0)
B.(0,1)
C.(1,2)
D.(1,+∞)
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已知双曲线
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123733327796320/SYS201310251237333277963009_ST/0.png)
的焦距为2c,离心率为e,若点(-1,0)与点(1,0)到直线
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123733327796320/SYS201310251237333277963009_ST/1.png)
的距离之和为S,且S
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123733327796320/SYS201310251237333277963009_ST/2.png)
,则离心率e的取值范围是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123733327796320/SYS201310251237333277963009_ST/3.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123733327796320/SYS201310251237333277963009_ST/4.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123733327796320/SYS201310251237333277963009_ST/5.png)
D.
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右表提供了某厂节能降耗技术改造后生产A产品过程中记录的产量x(吨)与相应的生产能耗y(吨标准煤)的几组对应数据.根据下表提供的数据,求出y关于x的线性回归方程为
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123733327796320/SYS201310251237333277963008_ST/0.png)
=0.7x+0.35,那么表中t的值为( )
A.3
B.3.15
C.3.5
D.4.5
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如图,给定两个平面单位向量
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123733327796320/SYS201310251237333277963007_ST/0.png)
和
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123733327796320/SYS201310251237333277963007_ST/1.png)
,它们的夹角为120°,点C在以O为圆心的圆弧AB上,且
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(其中x,y∈R),则满足x+y≥
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123733327796320/SYS201310251237333277963007_ST/3.png)
的概率为( )
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123733327796320/SYS201310251237333277963007_ST/images4.png)
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123733327796320/SYS201310251237333277963007_ST/4.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123733327796320/SYS201310251237333277963007_ST/5.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123733327796320/SYS201310251237333277963007_ST/6.png)
D.
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