在
中,满足
的夹角为
,M是AB的中点
(1)若
,求向量
的夹角的余弦值
(2)若
,在AC上确定一点D的位置,使得
达到最小,并求出最小值
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f2333da32638ec636fa1e69e750ca4a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/141f20cf091c435fe4df2e996df94f79.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9bf2423499d45354dbc8377f1f04e16.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cece2e87880c8901d783b95f7fcfccc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad441f6d8707c76f106d2f66529db4eb.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a177427f21b6e56acc26ad526e3d6565.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64995cfc612a335f6b14e14f2aa2dc57.png)
10-11高三上·浙江杭州·期中 查看更多[2]
更新时间:2016-11-30 10:51:00
|
【知识点】 向量在几何中的应用
相似题推荐
解答题-问答题
|
适中
(0.65)
【推荐1】如图,在梯形
中,
,
,
是
的两个三等分点,
,
是
的两个三等分点,线段
上一动点
满足
,
分别交
,
于
,
两点,记
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/12/cb636e8e-f9e0-4d40-a985-581c46d893d6.png?resizew=326)
(1)当
时,用
,
表示
:
(2)若
,试写出
和
的关系,并求出
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8ba2021caf4381dad4f73474912a8d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0010d180f5a6f298e7e866b368fe4f23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e55e398e8520d8a36fb5a625a085b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c83f1f880e5ffbff036953acaca90c41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e7a93a1399ff7a2bde342652479241b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/775a45e4001e3063b5b70013f32d3a4b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/12/cb636e8e-f9e0-4d40-a985-581c46d893d6.png?resizew=326)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73b3cf0f585938ede9eca890a6eb326d.png)
![](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/68f654198c1e01d97f1378b35d7c68ca.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d1fb48daae6191e74ca31896e7aedae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1100379a4385b9ce064847bc21760adc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1100379a4385b9ce064847bc21760adc.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐2】已知
为平面内不共线的三点,
表示
的面积
(1)若![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57242c7e53e65fd554af990a54093974.png)
求
;
(2)若
,
,
,证明:
;
(3)若
,
,
,其中,且坐标原点
恰好为
的重心,判断
是否为定值,若是,求出该定值;若不是,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5cbff84327e964f912a54032e76ccc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57242c7e53e65fd554af990a54093974.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19b3c25337731049417172e162cb6869.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5cbff84327e964f912a54032e76ccc9.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fbd6303756adb878c1e028f511e51f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8df332f01628130c084fd46aaca0a4b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ddf140d78ed70107444987a1c0fa8bf5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36f4a0297f283b65777d12a0cca5a280.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46c54ea6998fdda549ff99a5c3d112c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be921ce0a721c5e9a4a09a94f5ee95a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c2d9da5319d043549a74c3c05bf1413.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5cbff84327e964f912a54032e76ccc9.png)
您最近一年使用:0次