多项式-2x3+4x在实数范围进行因式分解可得 .
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如图所示,P是菱形ABCD的对角线AC上一动点,过P垂直于AC的直线交菱形ABCD的边于M、N两点,设AC=2,BD=1,AP=x,则△AMN的面积为y,则y关于x的函数图象的大致形状是( )
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A.
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B.
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C.
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D.
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Rt△ABC中,∠C=90°,a、b、c分别是∠A、∠B、∠C的对边,那么c等于( )
A.acosA+bsinB
B.asinA+bsinB
C.
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D.
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如图,A、B是双曲线
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101190906720090824/SYS201311011909067200908007_ST/0.png)
上的点,A、B两点的横坐标分别是a、2a,线段AB的延长线交x轴于点C,若S
△AOC=6.则k的值为( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101190906720090824/SYS201311011909067200908007_ST/images1.png)
A.1
B.2
C.4
D.无法确定
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如图,△MBC中,∠B=90°,∠C=60°,MB=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101190906720090824/SYS201311011909067200908006_ST/0.png)
,点A在MB上,以AB为直径作⊙O与MC相切于点D,则CD的长为( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101190906720090824/SYS201311011909067200908006_ST/images1.png)
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101190906720090824/SYS201311011909067200908006_ST/1.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101190906720090824/SYS201311011909067200908006_ST/2.png)
C.2
D.3
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已知
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101190906720090824/SYS201311011909067200908005_ST/0.png)
,x为整数,则M,N的大小关系是( )
A.M>N
B.M=N
C.M<N
D.无法确定
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