如图,菱形ABCD的对角线AC,BD交于点O.过O作OE⊥AB于点E.延长EO交CD于点F,若AC=8,BD=6,则EF的值为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/2/8672a256-6bcf-4998-9ed8-d4511f7f8ad9.png?resizew=196)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/2/8672a256-6bcf-4998-9ed8-d4511f7f8ad9.png?resizew=196)
A.5 | B.![]() | C.![]() | D.![]() |
2021·陕西·模拟预测 查看更多[2]
更新时间:2021-09-02 10:29:46
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【推荐1】如图,
都是
的半径,
交于点D.若
,则
的长为( ).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/750e8652e3d3976bfc17e2c88ccec42b.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f33a50e0b3c10614115a183f6bc755c8.png)
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A.5 | B.4 | C.3 | D.2 |
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【推荐2】如图,在等腰
中,
是
边上的中点,点
分别在
边上运动,且保持
,连接
.在此运动变化的过程中,下列结论:①
是等腰直角三角形;②四边形
的面积是定值9;③
的面积最小值为4.5;④
长度的最小值为3.其中正确的结论是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/25/e56c312e-3e13-4ca4-921a-dfaf3d26ab13.png?resizew=162)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d42218a68301d770accaaefb96b19f8a.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3fd09f591e95fd40e8ecfe6020f9f46.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/25/e56c312e-3e13-4ca4-921a-dfaf3d26ab13.png?resizew=162)
A.①②③ | B.①②④ | C.①③④ | D.②③④ |
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【推荐1】若一个菱形的两条对角线长分别是关于
的一元二次方程
的两个实数根,且其面积为11,则该菱形的边长为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/124ce097ed737ef2ef647eb241772c6c.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐2】已知一元二次方程x2﹣14x+48=0的两个根是菱形的两条对角线长,则这个菱形的面积为( )
A.12 | B.24 | C.10 | D.8 |
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