点
和点
关于
轴对称,则
的值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7adc1beb8760a9541bc103ad279c267.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf728715c69468bb5c484e258d48bcd4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/059d6df06a5b85848dc4fa33327f8e07.png)
A.![]() | B.![]() | C.![]() | D.![]() |
更新时间:2024-01-26 18:25:01
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【推荐1】若有理数
满足
,
,且
,则
的值为( )
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A.![]() | B.7或1 | C.7或![]() | D.![]() ![]() |
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【推荐2】古希腊几何学家海伦和我国南宋数学家秦九韶曾提出利用三角形的三边求面积的公式,称为海伦﹣秦九韶公式:如果一个三角形的三边长分别是a,b,c,记
,那么三角形的面积为
.如图,在
中,
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,
所对的边分别为a,b,c,若
,
,
,则
的面积为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0f2d50ca5cc415bf6721faf2221d626.png)
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【推荐1】在平面直角坐标系中,与点
关于x轴对称的点的坐标为( )
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【推荐2】如图,在平面直角坐标系中,对
进行循环往复地轴对称变换,若原来点A的坐标是
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A.![]() | B.![]() | C.![]() | D.![]() |
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