不等式组
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022164346518582711/SYS201310221643465185827015_ST/0.png)
的解集是
.
考点分析:
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某班级从文化用品市场购买了签字笔和圆珠笔共15支,所付金额大于26元,但小于27元.已知签字笔每支2元,圆珠笔每支1.5元,则其中签字笔购买了
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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( )
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A.(2+
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,
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B.(2-
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C.(-2+
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,
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)
D.(-2-
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函数y=ax+1与y=ax
2+bx+1(a≠0)的图象可能是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022164346518582711/SYS201310221643465185827010_ST/images0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022164346518582711/SYS201310221643465185827010_ST/images1.png)
C.
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D.
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