如图,
、
是以
为直径的圆上的两点,其中
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5487766cf7f2c4c54fa5aadc69ff5e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18c0098e82d41438224ce472054e5490.png)
A.1 | B.2 | C.![]() | D.![]() |
更新时间:2024-05-25 20:22:01
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【推荐1】在边长为2的等边△ABC中,D为AC的中点,M为AB边上一动点,则
的最小值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c441c4898a0983e4c59015abd36a1853.png)
A.![]() | B.![]() | C.2 | D.![]() |
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【推荐2】给定两个长度为2的平面向量
和
,它们的夹角为120°.如图所示.点
在以
为圆心2为半径的圆弧
上运动.则
的最小值为
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/22/4f555b9d-f691-44b4-97de-02fcf310ac53.png?resizew=145)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d60dcb171bb7fd972aab8294d63acdb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f68628a408537b1cf3bf1ca2a69731b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1ac7f4e06fa3ed9ced34535f177976f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/22/4f555b9d-f691-44b4-97de-02fcf310ac53.png?resizew=145)
A.![]() | B.![]() | C.0 | D.2 |
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【推荐1】已知
中,
分别是内角
所对的边,
为边
上的高,有以下结论:①
;②
;③
;④
,则其中正确的结论个数为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7f5573b30734d65648f61c0a94c98de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38335830b93ac4d99c28a8e209eecb3f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/826c728050e3378921442ace20269ef6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a032895c32b6d7654be184fa87deeab2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c71926b77ed7ead37efdde9e2e5b61d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a888a7a8edd0eff9774cee56735f175.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f251900e6a3dc968cfa2630533108e0.png)
A.1个 | B.2个 | C.3个 | D.4个 |
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【推荐2】如图,在直角三角形
中,
,
为边
上一点,且
,则
( )
![](https://img.xkw.com/dksih/QBM/2021/8/22/2791483316838400/2794016485801984/STEM/5480f8c4-f86e-4771-90a9-4757434c4cdb.png?resizew=218)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274a77343ecde1c2665df291761b6563.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52705567101a48893de582656ef41527.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fdda4be243b81c13fb6156662c6f1bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0213d69b3012db07149de7e96c3f657f.png)
![](https://img.xkw.com/dksih/QBM/2021/8/22/2791483316838400/2794016485801984/STEM/5480f8c4-f86e-4771-90a9-4757434c4cdb.png?resizew=218)
A.![]() | B.![]() |
C.![]() | D.![]() |
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解题方法
【推荐3】平面向量
与
的夹角为
,
则
等于( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb80eb942aafb194fadc473776f35b1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/433b94c39737727e53468df419d8314a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d5bca00fa20e6e80480b9d06d2e52ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/461d794e5d360044d47e28d9f91c7612.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38a857f2454931fbe1eeaa9ecb12d75d.png)
A.![]() | B.![]() | C.4 | D.12 |
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