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如图,四边形ABCD中,∠BAD=∠ACB=90°,AB=AD,AC=4BC,设...
如图,四边形ABCD中,∠BAD=∠ACB=90°,AB=AD,AC=4BC,设CD的长为x,四边形ABCD的面积为y,则y与x之间的函数关系式是( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101190130758128796/SYS201311011901307581287007_ST/images0.png)
A.y=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101190130758128796/SYS201311011901307581287007_ST/0.png)
B.y=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101190130758128796/SYS201311011901307581287007_ST/1.png)
C.y=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101190130758128796/SYS201311011901307581287007_ST/2.png)
D.y=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101190130758128796/SYS201311011901307581287007_ST/3.png)
考点分析:
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如图表示一个由相同小立方块搭成的几何体的俯视图,小正方形中的数字表示该位置上小立方块的个数,那么该几何体的主视图为( )
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式子
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101190130758128796/SYS201311011901307581287002_ST/0.png)
有意义,则x的取值范围是( )
A.x≥2
B.x≤2
C.x≥-2
D.x≤-2
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