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1 . 已知点
关于坐标平面
的对称点为
,则
,
两点间的距离为_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df69d8ff6d65e9c6c3414df9201889e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
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3卷引用:宁夏银川市第二中学2020-2021学年高一下学期期末数学试题
名校
2 . 若
,
,
,
为
的中点,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/422a1fef34cc5b27fe3c9ec1aa95546d.png)
________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c15c60ef27700e074df1a670a374d913.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/050b4df4c78b241ee03210e37313d7b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9020f97648a76ada898c3ce24199827d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/422a1fef34cc5b27fe3c9ec1aa95546d.png)
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4卷引用:宁夏固原市隆德县2020-2021学年高一上学期期末考试数学试题
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