如图,在平面直角坐标系中,已知点A(2,4),B(4,1),以原点O为位似中心,将△OAB扩大为原来的4倍,则点A的对应点的坐标是( )
![](https://img.xkw.com/dksih/QBM/2020/9/11/2547591928471552/2551263343984640/STEM/b5aeeffded3a4b98937d46bceba74868.png?resizew=143)
![](https://img.xkw.com/dksih/QBM/2020/9/11/2547591928471552/2551263343984640/STEM/b5aeeffded3a4b98937d46bceba74868.png?resizew=143)
A.(![]() | B.(-![]() | C.(8,16)或(﹣16,﹣8) | D.(8,16)或(﹣8,﹣16) |
更新时间:2020-09-18 21:51:28
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【知识点】 求位似图形的对应坐标解读
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【推荐1】如图,在△AOB中,A,B两点在x轴上方,以点O为位似中心,在x轴的下方作△AOB的位似图形△
,把△AOB的边长放大到原来的2倍,设点B的对应点
的坐标是(4,﹣2),则点B的坐标是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/23/a44ebd90-0ffe-416f-833a-00daa0e520c8.png?resizew=226)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebde0f9926b3fe557dedf38fcb063682.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c5d54dfb9237412a7c1c00658830de6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/23/a44ebd90-0ffe-416f-833a-00daa0e520c8.png?resizew=226)
A.(2,1) | B.(2,﹣1) |
C.(﹣2,1) | D.(﹣2,﹣1) |
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【推荐2】在平面直角坐标系中,
和
的相似比等于
,并且是关于原点
的位似图形,若点
的坐标为
,则其对应点
的坐标是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62c3135fa20c32d04a270750f77c1f2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9405741735c6bfbbbfcb52ae03069b22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
A.![]() | B.![]() | C.![]() ![]() | D.![]() ![]() |
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