![](https://img.xkw.com/dksih/QBM/2014/9/26/1573750580740096/1573750585868288/STEM/7ae8f31664d7471b896634f193f0aefe.png)
![](https://img.xkw.com/dksih/QBM/2014/9/26/1573750580740096/1573750585868288/STEM/a2ccbad6404b4ef5884b802bb802c0c4.png)
![](https://img.xkw.com/dksih/QBM/2014/9/26/1573750580740096/1573750585868288/STEM/355746a2c05e43e0b14a52dc6b94b6c0.png)
![](https://img.xkw.com/dksih/QBM/2014/9/26/1573750580740096/1573750585868288/STEM/cf0f9f4ab00c41d4b461134b0bd950f8.png)
![](https://img.xkw.com/dksih/QBM/2014/9/26/1573750580740096/1573750585868288/STEM/eff208a99e4a479c965a1eba3c02b3f7.png)
![](https://img.xkw.com/dksih/QBM/2014/9/26/1573750580740096/1573750585868288/STEM/684db180063e4675a242fe0f67df8ad6.png)
A.![]() | B.![]() | C.![]() | D.![]() |
更新时间:2014-09-26 17:28:36
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【知识点】 画已知图形关于某点对称的图形解读
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【推荐1】如图,在直角坐标系中,已知菱形OABC的顶点A(1,2),B(3,3).作菱形OABC关于y轴的对称图形OA′B′C′,再作图形OA′B′C′关于点O的中心对称图形OA″B″C″,则点C的对应点C″的坐标是( )
![](https://img.xkw.com/dksih/QBM/2019/6/19/2228840928206848/2229049891291136/STEM/459f357810ec4399bc42a34bb89576de.png?resizew=121)
![](https://img.xkw.com/dksih/QBM/2019/6/19/2228840928206848/2229049891291136/STEM/459f357810ec4399bc42a34bb89576de.png?resizew=121)
A.(2,-1) | B.(1,-2) | C. (-2,1) | D. (-2,-1) |
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【推荐2】三个全等的等边三角形按图1所示位置摆放,现添加一个大小相同的等边三角形,使四个等边三角形组成一个中心对称图形(如图2),则添加的等边三角形所放置的位置是( )
A.① | B.② | C.③ | D.④ |
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