已知向量
满足:
为单位向量,且
与
相互垂直,又对任意
不等式
恒成立,若
,则
的最小值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23c5d7ba714351d679bbbb287af5aaec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c94075193c11fe43f2396cff5a485054.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b83c5803cc8c05849028a57c4bd4ee72.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a06c8eae3652486cf9e416ce3a8ffc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d89edb09a343c23e415b3e7d8fd837b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dac6ef8c5afe13c4a6a1eb67086f11d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0719bceff0114835c72cb6e25831d04c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83634e314df24df73ae37d25a44d20e3.png)
A.4 | B.5 | C.6 | D.7 |
23-24高一下·重庆万州·期中 查看更多[2]
更新时间:2024-05-02 13:26:27
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【推荐1】已知
、
是椭圆
的左、右焦点,点
是椭圆上任意一点,以
为直径作圆
,直线
与圆
交于点
(点
不在椭圆内部),则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b8c08c219677d8244bac4f33aaeaeb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5076289823db419f94e9c0c8f4aafd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3fb78c5f885034612c0e030b920143d.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ac86e1c253297a377e14fb9a1689be8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88e9f7d1272b7344346b58b660aa260a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
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A.![]() | B.4 | C.3 | D.1 |
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【推荐2】若等边
的边长为2,顶点B,C分别在x轴、y轴的非负半轴上滑动,M为
的中点,则
的最大值是( )
![](https://img.xkw.com/dksih/QBM/2020/4/16/2442972240076800/2443612537716736/STEM/1ce69615973347fc97d2031aaa4af407.png?resizew=139)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a8155db63bad2d1a9200e1beef40f22.png)
![](https://img.xkw.com/dksih/QBM/2020/4/16/2442972240076800/2443612537716736/STEM/1ce69615973347fc97d2031aaa4af407.png?resizew=139)
A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐1】已知平面内,
,
,且
,则
的最大值等于
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a61c45010c33b22f3a946a3ef59d838a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d929fbed15f4c1d4a114de7e61373593.png)
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A.13 | B.15 | C.19 | D.21 |
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【推荐2】“圆幂定理”是平面几何中关于圆的一个重要定理,它包含三个结论,其中一个是相交弦定理:圆内的两条相交弦,被交点分成的两条线段长的积相等,如图,已知圆
的半径2,点
是圆
内的定点,且
,弦
均过点
,则下列说法错误的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
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A.![]() |
B.当![]() ![]() |
C.![]() ![]() |
D.![]() |
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