一个正多边形的每个外角都是36°,这个正多边形的边数是 .
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若
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有意义,则x的取值范围是
.
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菱形OABC在平面直角坐标系中的位置如图所示,若OA=2,∠AOC=45°,则B点的坐标是( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022164346518582711/SYS201310221643465185827011_ST/images0.png)
A.(2+
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,
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)
B.(2-
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,
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022164346518582711/SYS201310221643465185827011_ST/3.png)
)
C.(-2+
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,
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)
D.(-2-
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,
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)
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函数y=ax+1与y=ax
2+bx+1(a≠0)的图象可能是( )
A.
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B.
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C.
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D.
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如图,是小华画的正方形风筝图案,他以图中的对角线AB为对称轴,在对角线的下方再画一个三角形,使得新的风筝图案成为轴对称图形,若下列有一图形为此对称图形,则此图为( )
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A.
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B.
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C.
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D.
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将直径为60cm的圆形铁皮,做成三个相同的圆锥容器的侧面(不浪费材料,不计接缝处的材料损耗),那么每个圆锥容器的底面半径为( )
A.10cm
B.30cm
C.45cm
D.300cm
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