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sin163°•sin223°+sin253°•sin313°= .
sin163°•sin223°+sin253°•sin313°= .
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已知函数y=f(x)是定义在R上的奇函数,且当x∈(-∞,0)时,不等式f(x)+xf′(x)>0恒成立,若a=2
0.3f(2
0.3),b=(log
π2)f(log
π2),c=(log
2![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102448158331855/SYS201311031024481583318009_ST/0.png)
)f(log
2![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102448158331855/SYS201311031024481583318009_ST/1.png)
),则a、b、c的大小关系是( )
A.a>b>c
B.c>b>a
C.b>a>c
D.a>c>b
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下列命题中,真命题的个数为( )
(1)在△ABC中,若A>B,则sinA>sin B;
(2)已知
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102448158331855/SYS201311031024481583318008_ST/0.png)
上的投影为-2;
(3)已知p:∃x∈R,cosx=1,q:∀R,x
2-x+1>0,则“p∧¬q”为假命题
(4)要得到函数
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102448158331855/SYS201311031024481583318008_ST/1.png)
的图象,只需将
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102448158331855/SYS201311031024481583318008_ST/2.png)
的图象向左平移
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102448158331855/SYS201311031024481583318008_ST/3.png)
个单位.
A.1
B.2
C.3
D.4
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△ABC中,A=
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102448158331855/SYS201311031024481583318007_ST/0.png)
,BC=3,则△ABC的周长为( )
A.4
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102448158331855/SYS201311031024481583318007_ST/1.png)
sin(B+
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102448158331855/SYS201311031024481583318007_ST/2.png)
)+3
B.4
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102448158331855/SYS201311031024481583318007_ST/3.png)
sin(B+
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102448158331855/SYS201311031024481583318007_ST/4.png)
)+3
C.6sin(B+
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102448158331855/SYS201311031024481583318007_ST/5.png)
)+3
D.6sin(B+
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102448158331855/SYS201311031024481583318007_ST/6.png)
)+3
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已知:如图
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102448158331855/SYS201311031024481583318006_ST/0.png)
的夹角为
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102448158331855/SYS201311031024481583318006_ST/1.png)
的夹角为30°,若
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102448158331855/SYS201311031024481583318006_ST/2.png)
等于( )
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102448158331855/SYS201311031024481583318006_ST/images3.png)
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102448158331855/SYS201311031024481583318006_ST/3.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102448158331855/SYS201311031024481583318006_ST/4.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102448158331855/SYS201311031024481583318006_ST/5.png)
D.2
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函数f(x)=x
3+2x-1的零点所在的区间是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102448158331855/SYS201311031024481583318005_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102448158331855/SYS201311031024481583318005_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102448158331855/SYS201311031024481583318005_ST/2.png)
D.
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