如图,在△OAB中, CD∥AB,若OC:OA =1:2,则下列结论:(1)
;(2)
;(3)
. 其中正确的结论是( )
![](https://img.xkw.com/dksih/QBM/2013/4/1/1573629169377280/1573629222051840/STEM/df9631676337435896de26b9a56fc62a.png?resizew=95)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1293353ee183d709f8547ea657f50048.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12143a06ed24558d8cc7ad39961d3e1f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e8862b641ced92db2764c9158489b09.png)
![](https://img.xkw.com/dksih/QBM/2013/4/1/1573629169377280/1573629222051840/STEM/df9631676337435896de26b9a56fc62a.png?resizew=95)
A.(1)(2) | B.(1)(3) | C.(2)(3) | D.(1)(2)(3) |
13-14九年级上·北京通州·期末 查看更多[2]
更新时间:2016-12-05 16:59:45
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【知识点】 相似三角形的判定与性质综合
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【推荐1】如图,比例规是伽利略发明的一种画图工具,使用它可以把线段按一定比例伸长或缩短,它是由长度相等的两脚AD和BC交叉构成的.如果把比例规的两脚合上,使螺丝钉固定在刻度3的地方(即同时使OA=3OD,OB=3OC),然后张开两脚,使A、B两个尖端分别在线段l的两个端点上,若CD=3cm,则AB的长是( )
![](https://img.xkw.com/dksih/QBM/2021/12/28/2889497959759872/2946674140307456/STEM/2f5cb3bbbfca4dce89c582aefd529adf.png?resizew=84)
![](https://img.xkw.com/dksih/QBM/2021/12/28/2889497959759872/2946674140307456/STEM/2f5cb3bbbfca4dce89c582aefd529adf.png?resizew=84)
A.9cm | B.12cm | C.15cm | D.18cm |
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【推荐2】如图,已知
与
位似,位似中心为点O,且
,则
的面积与
的面积之比为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/3/e58b77b8-6f53-496d-a7bd-05a0b2c80cdc.png?resizew=195)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0fe23dc08450aa28cbb494935a7deb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/3/e58b77b8-6f53-496d-a7bd-05a0b2c80cdc.png?resizew=195)
A.![]() | B.![]() | C.![]() | D.![]() |
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