分解因式:x3-7x2+12x= .
考点分析:
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某校九年级(2)班有50名同学,综合素质评价“运动与健康”方面的等级统计如图所示,则该班“运动与健康”评价等级为A的人数是
人.
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如图,在Rt△ABC中,∠ACB=90°,点D是斜边AB的中点,DE⊥AC,垂足为E,若BC=4,CD=2
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,则BE的长为( )
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A.2
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101193716221132325/SYS201311011937162211323009_ST/1.png)
B.3
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C.2
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D.4
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将矩形ABCD沿AE折叠,使点D落在D′处,已知∠CED′=60°,DE=1,则DD′的长为( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101193716221132325/SYS201311011937162211323008_ST/images0.png)
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101193716221132325/SYS201311011937162211323008_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101193716221132325/SYS201311011937162211323008_ST/1.png)
C.2
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D.3
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![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101193716221132325/SYS201311011937162211323007_ST/images0.png)
正比例函数y=x与反比例函数y=
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的图象相交于A、C两点.AB⊥x轴于B,CD⊥y轴于D(如图),则四边形ABCD的面积为( )
A.1
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101193716221132325/SYS201311011937162211323007_ST/1.png)
C.2
D.
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