若二次根式
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有意义,则x的取值范围是
.
考点分析:
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湛江市2009年平均房价为每平方米4000元.连续两年增长后,2011年平均房价达到每平方米5500元,设这两年平均房价年平均增长率为x,根据题意,下面所列方程正确的是( )
A.5500(1+x)
2=4000
B.5500(1-x)
2=4000
C.4000(1-x)
2=5500
D.4000(1+x)
2=5500
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下列图象中,能反映函数y随x增大而减小的是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101192922644474668/SYS201311011929226444746008_ST/images0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101192922644474668/SYS201311011929226444746008_ST/images1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101192922644474668/SYS201311011929226444746008_ST/images2.png)
D.
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如图,函数y=2x和y=ax+4的图象相交于点A(m,3),则不等式2x<ax+4的解集为( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101192922644474668/SYS201311011929226444746007_ST/images0.png)
A.x<
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B.x<3
C.x>
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101192922644474668/SYS201311011929226444746007_ST/1.png)
D.x>3
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如图所示的几何体的左视图是( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101192922644474668/SYS201311011929226444746006_ST/images0.png)
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101192922644474668/SYS201311011929226444746006_ST/images1.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101192922644474668/SYS201311011929226444746006_ST/images2.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101192922644474668/SYS201311011929226444746006_ST/images3.png)
D.
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在平面直角坐标系中,将抛物线y=x
2-4先向右平移两个单位,再向上平移两个单位,得到的抛物线的解析式是( )
A.y=(x+2)
2+2
B.y=(x-2)
2-2
C.y=(x-2)
2+2
D.y=(x+2)
2-2
查看答案