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在下列各式中,化简正确的是( ) A.=3 B.=± C.=a2 D.
在下列各式中,化简正确的是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000722062634549/SYS201311030007220626345005_ST/0.png)
=3
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000722062634549/SYS201311030007220626345005_ST/1.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000722062634549/SYS201311030007220626345005_ST/2.png)
=±
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000722062634549/SYS201311030007220626345005_ST/3.png)
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000722062634549/SYS201311030007220626345005_ST/4.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000722062634549/SYS201311030007220626345005_ST/5.png)
=a
2![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000722062634549/SYS201311030007220626345005_ST/6.png)
D.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000722062634549/SYS201311030007220626345005_ST/7.png)
考点分析:
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A.1
B.2
C.3
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如图,将△ABC绕点A逆时针旋转80°得到△AB′C′.若∠BAC=50°,则∠CAB′的度数为( )
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A.30°
B.40°
C.50°
D.80°
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下列图案中既是轴对称图形又是中心对称图形的是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000722062634549/SYS201311030007220626345002_ST/images0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000722062634549/SYS201311030007220626345002_ST/images1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000722062634549/SYS201311030007220626345002_ST/images2.png)
D.
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下列方程中,一定是一元二次方程的是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000722062634549/SYS201311030007220626345001_ST/0.png)
B.(x+2)(2x-1)=2x
2C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000722062634549/SYS201311030007220626345001_ST/1.png)
D.ax
2+bx+c=0
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下列式子:
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000722062634549/SYS201311030007220626345000_ST/0.png)
、
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000722062634549/SYS201311030007220626345000_ST/1.png)
、
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000722062634549/SYS201311030007220626345000_ST/2.png)
、
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000722062634549/SYS201311030007220626345000_ST/3.png)
(x>0)、
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000722062634549/SYS201311030007220626345000_ST/4.png)
、
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000722062634549/SYS201311030007220626345000_ST/5.png)
、-
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000722062634549/SYS201311030007220626345000_ST/6.png)
、
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000722062634549/SYS201311030007220626345000_ST/7.png)
、
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000722062634549/SYS201311030007220626345000_ST/8.png)
(x≥0,y≥0),二次根式有( )个.
A.3
B.4
C.5
D.6
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