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计算:sin43°cos13°-sin13°cos43°的值等于( ) A. B...
计算:sin43°cos13°-sin13°cos43°的值等于( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101852852183727/SYS201311031018528521837001_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101852852183727/SYS201311031018528521837001_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101852852183727/SYS201311031018528521837001_ST/2.png)
D.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101852852183727/SYS201311031018528521837001_ST/3.png)
考点分析:
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A.{x|x≥3}
B.{x|x≤-3}
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D.{x|2<x≤3}
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设x,y满足
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,若目标函数z=ax+y(a>0)最大值为14,则a为( )
A.
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B.23
C.2
D.1
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把函数
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图象上各点的横坐标缩短到原来的
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倍(纵坐标不变),再将图象向右平移
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![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101841589056709/SYS201311031018415890567005_ST/3.png)
B.
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C.
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D.
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△ABC的内角A、B、C的对边分别为a、b、c,若a、b、c成等比数列,且c=2a,则cosB=( )
A.
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B.
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C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101841589056709/SYS201311031018415890567004_ST/2.png)
D.
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在等比数列{a
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4a
5a
6a
7a
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A.81
B.27
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101841589056709/SYS201311031018415890567003_ST/0.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101841589056709/SYS201311031018415890567003_ST/1.png)
D.243
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