如图,在扇形OAB中,半径
,
,C在半径OB上,D在半径OA上,E是扇形弧上的动点(不包含端点),则平行四边形BCDE的周长的取值范围是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6e3dfcd8aff269dd5aba398816490c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20ccc37b189fa2cbc269ca0b233dac37.png)
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更新时间:2024-05-27 22:14:25
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单选题
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适中
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名校
【推荐1】已知向量
均为单位向量,且
,向量
满足
,则
的最大值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8e8b95a61af300412fc65f846089028.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8bf21fef3026cfe445a855c94cab5c84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73a0b19e69be46452425916a0fcb49c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6ed3acefaee304551d064c6cd46a0ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2db12ddbd0170d18e5bef2c3e71f87b.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐2】设实数
为函数
的最大值,则
的展开式中
的系数是
![](https://img.xkw.com/dksih/QBM/2011/5/6/1570182930989056/1570182935617536/STEM/0246d9d3d71c4ee1a75d6a283d27b7ee.png?resizew=13)
![](https://img.xkw.com/dksih/QBM/2011/5/6/1570182930989056/1570182935617536/STEM/dea534f58b214746b8140506049b797e.png?resizew=175)
![](https://img.xkw.com/dksih/QBM/2011/5/6/1570182930989056/1570182935617536/STEM/11294213cbc34004a509ee0e0837d01e.png?resizew=89)
![](https://img.xkw.com/dksih/QBM/2011/5/6/1570182930989056/1570182935617536/STEM/cfcdc8080931442eae460ce7d982c88b.png?resizew=19)
A.192 | B.182 | C.–192 | D.–182 |
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解题方法
【推荐1】如图,已知四面体
的棱![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
平面
,且
,其余的棱长均为
.四面体
以
所在的直线为轴旋转
弧度,且四面体
始终在水平放置的平面
的上方.如果将四面体
在平面
内正投影面积看成关于
的函数,记为
,则函数
的最小正周期与
的最小值分别为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/8/127bf117-0754-45ea-8574-9b551324596a.png?resizew=214)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/638537c0a30676c73fea76c80e0f8bd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21ea52361458ce2e49ed0fe99d8e6c02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3888740fa8b552b55b4a0c8ae4166007.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3888740fa8b552b55b4a0c8ae4166007.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3888740fa8b552b55b4a0c8ae4166007.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/8/127bf117-0754-45ea-8574-9b551324596a.png?resizew=214)
A.![]() ![]() | B.![]() ![]() | C.![]() ![]() | D.![]() ![]() |
您最近一年使用:0次
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解题方法
【推荐2】已知长方体
中,
.若
是侧面
内的动点,且
,则
的长度的最小值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bc47c942cbeed3c3553c2b1ea28aee5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e168672b47d7e64dc1b404f8882c7dcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90a52818f1e8b7c27f207abae182a64d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9399c9a2a31b0e3165aea2d6ccc4f7c9.png)
A.![]() | B.6 | C.![]() | D.![]() |
您最近一年使用:0次
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解题方法
【推荐2】在
中,
,
,
,当
的周长最短时,
的长是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26fdd8e57562ba94e10e7f1d770826d0.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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