(文)设x,y满足约束条件
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123704043310317/SYS201310251237040433103011_ST/0.png)
若
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123704043310317/SYS201310251237040433103011_ST/1.png)
的最小值为
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123704043310317/SYS201310251237040433103011_ST/2.png)
,则a的值
.
考点分析:
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从1=1,1-4=-(1+2),1-4+9=1+2+3,1-4+9-16=-(1+2+3+4),…,推广到第n个等式为
.
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已知f(x)是奇函数,且f(2-x)=f(x),当x∈[2,3]时,f(x)=log
2(x-1),则当x∈[1,2]时,f(x)=( )
A.-log
2(3-x)
B.log
2(4-x)
C.-log
2(4-x)
D.log
2(3-x)
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![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123704043310317/SYS201310251237040433103008_ST/images0.png)
为了从甲乙两人中选一人参加数学竞赛,老师将二人最近6次数学测试的分数进行统计,甲乙两人的平均成绩分别是
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123704043310317/SYS201310251237040433103008_ST/0.png)
、
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123704043310317/SYS201310251237040433103008_ST/1.png)
,则下列说法正确的是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123704043310317/SYS201310251237040433103008_ST/2.png)
>
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123704043310317/SYS201310251237040433103008_ST/3.png)
,乙比甲成绩稳定,应选乙参加比赛
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123704043310317/SYS201310251237040433103008_ST/4.png)
>
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123704043310317/SYS201310251237040433103008_ST/5.png)
,甲比乙成绩稳定,应选甲参加比赛
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123704043310317/SYS201310251237040433103008_ST/6.png)
<
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123704043310317/SYS201310251237040433103008_ST/7.png)
,甲比乙成绩稳定,应选甲参加比赛
D.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123704043310317/SYS201310251237040433103008_ST/8.png)
<
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123704043310317/SYS201310251237040433103008_ST/9.png)
,乙比甲成绩稳定,应选乙参加比赛
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运行如图所示框图的相应程序,若输入a,b的值分别为log
23和log
32,则输出M的值是( )
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123704043310317/SYS201310251237040433103007_ST/images0.png)
A.0
B.1
C.2
D.-1
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已知点F
1(-4,0)和F
2(4,0),曲线上的动点P到F
1、F
2的距离之差为6,则曲线方程为( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123704043310317/SYS201310251237040433103006_ST/0.png)
-
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123704043310317/SYS201310251237040433103006_ST/1.png)
=1
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123704043310317/SYS201310251237040433103006_ST/2.png)
-
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123704043310317/SYS201310251237040433103006_ST/3.png)
=1(y>0)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123704043310317/SYS201310251237040433103006_ST/4.png)
-
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123704043310317/SYS201310251237040433103006_ST/5.png)
=1或
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123704043310317/SYS201310251237040433103006_ST/6.png)
-
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123704043310317/SYS201310251237040433103006_ST/7.png)
=1
D.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123704043310317/SYS201310251237040433103006_ST/8.png)
-
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123704043310317/SYS201310251237040433103006_ST/9.png)
=1
E.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123704043310317/SYS201310251237040433103006_ST/10.png)
-
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123704043310317/SYS201310251237040433103006_ST/11.png)
=1(x>0)
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