如图,在平面直角坐标系中,
的顶点为
,
,
.以点
为位似中心,在第三象限内作与
的位似比为
的位似图形
,则点
的坐标为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fe95f656b98b53f71a9d72bf0c9a4b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19b62194097ac66a5093c57fca2f5b4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5753b3abf0a6545abf4c6caeff5f192.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1871fad5b818837f699fc07638deae14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fe95f656b98b53f71a9d72bf0c9a4b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4807ca16360c0cca436e59d4be98f626.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
A.![]() | B.![]() | C.![]() | D.![]() |
2023·河北唐山·一模 查看更多[6]
更新时间:2023-04-19 18:38:57
|
【知识点】 求位似图形的对应坐标解读
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容易
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【推荐1】如图,在平面直角坐标系中,以原点为位似中心,将线段CD放大得到线段AB,若点B、C、D的坐标分别为B(5,0)、C(1,2)、D(2,0),则点A的坐标是( )
![](https://img.xkw.com/dksih/QBM/2016/11/29/1574256176275456/1574256181723136/STEM/ce757d476e274a6d8ebc5369cd7e4551.png)
![](https://img.xkw.com/dksih/QBM/2016/11/29/1574256176275456/1574256181723136/STEM/ce757d476e274a6d8ebc5369cd7e4551.png)
A.(2.5,5) | B.(2.5,3) | C.(3,5) | D.(2.5,4) |
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单选题
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容易
(0.94)
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【推荐2】如图,在平面直角坐标系中,已知点A(﹣3,6),B(﹣9,﹣3),以原点O为位似中心,相似比为
,把△ABO缩小,则点B的对应点B′的坐标是( )
![](https://img.xkw.com/dksih/QBM/2021/12/7/2867142986670080/2868618759028736/STEM/54040182359f442b8abe6aedf38238d6.png?resizew=206)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
![](https://img.xkw.com/dksih/QBM/2021/12/7/2867142986670080/2868618759028736/STEM/54040182359f442b8abe6aedf38238d6.png?resizew=206)
A.(﹣1,2) | B.(﹣3,1) |
C.(﹣3,﹣1)或(3,1) | D.(﹣1,2)或(1,﹣2) |
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