名校
1 . 在
中,过重心G的直线与
边交于P,与
边交于Q,点P,Q不与B,C重合.设
面积为
,
面积为
,
,
.
(1)求
;
(2)求证:
;
(3)求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9763846b1131e1e3e2d741ad95d5bb0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097c8d4c948de063796bd19f85b3a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a41f02922d11b0db07583b49135d73a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2d9d8a55bf739736288c0be3607490a.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b9802946e68ae1c7153b4496ee14735.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08677c8308807e4dca6fd9410d301a39.png)
(3)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/235f0a6fb218d28383e6f27f2df1f50f.png)
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2 . 如图所示,在平行四边形
中,点
为
中点,点
在
上,且
,记
,
.
为基底表示
;
(2)求证:
三点共线.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97a0103adccc3223f8d327aadf409207.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7b9d8a08fc52c31cc1a7f527d18b55c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/184359fe3cadc363cf4ebe586c2b3db4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b172cf8d898883d82e973f28c3c3a3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a014dff8997c661055229de29c61cfc.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a40e1ebf192fda9c0177b4be1870643.png)
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名校
解题方法
3 . 在
中,中线
和中线
相交于点
,点
在边
上.
(1)若
,证明:点
是边
上靠近点
的四等分点;
(2)证明:
;
(3)若
,求
中最大角与最小角的和.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd1c0fcbcbbbbcdb0878b63210a839c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/126b0abd82f8c42add560f2c7b98e593.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abbde778eea12ba7f606e4d9e52242fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
您最近一年使用:0次
名校
解题方法
4 . 记
的内角
,
,
的对边分别为
,
,
.已知
,点
在边
上,且
.
(1)证明:
;
(2)若
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/988b7e964e313579ab8869d67d5be007.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/2050e02cdae039810138121a5571162f.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c99f1f0b149bb29ab5f3592e0a551d39.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a81889370d45239939a36de53c4445d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ab6990b8426a4c952f6b9ad99e9f188.png)
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解题方法
5 . 如图,在
中,
分别是边
上的动点,
为
与
的交点.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/20/c9981012-cb14-4a70-9386-97d2e04e834d.jpg?resizew=190)
(1)证明:
;
(2)当
分别是边
的中点时,用
表示
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/927456b0989846a2f1573844bbaa2105.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a0e08a39c6619123557148d195abfbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/20/c9981012-cb14-4a70-9386-97d2e04e834d.jpg?resizew=190)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a289e14db6a5ec8bbbbb54c65411575c.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de31e9b221f5a1e50f5d7da963d555a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cca04b2a2b61d62a809776670a60c09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0be656083580a03c6481fb75881b84f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ef2723673c90347f6dd58346278c7fa.png)
您最近一年使用:0次
6 . 在
中,点M为边AB的中点,点N为边AC的中点,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ad7c4d9dc0b37116d76a49cf764a31f.png)
您最近一年使用:0次
2023-10-09更新
|
310次组卷
|
5卷引用:北师大版(2019)必修第二册课本习题第二章3.1向量的数乘运算
北师大版(2019)必修第二册课本习题第二章3.1向量的数乘运算(已下线)专题6.2 平面向量的运算-举一反三系列(已下线)6.2.3向量的数乘运算【第二练】“上好三节课,做好三套题“高中数学素养晋级之路(已下线)3.1 向量的数乘运算北师大版(2019)必修第二册课本例题3.1 向量的数乘运算
解题方法
7 . 如图,四边形ABCD是平行四边形,E,F分别是AD,DC的中点,BE,BF分别交AC于M,N.求证:M,N三等分AC.
您最近一年使用:0次
2023高二·全国·专题练习
解题方法
8 . 已知
为空间9个点(如图),并且
,
,
.
,求证:
(1)
四点共面;
(2)
;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/835a42aed01fa3cbce897f9ce23227ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab5a0a5347bb4a942331255cd5cf699b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed5a52c6b491bc8cc7b56083f9a755ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2c2ef38a7acb8b1e50c581bc9330401.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eeb57de13c584f341fa67a829e431a91.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/3/326639ff-92ea-4825-b65b-7bf2eb43f965.png?resizew=158)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c82a10b4f0c9323d726804c89dd9548.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0628ca06dd12a310d5fbdf6405c8a015.png)
您最近一年使用:0次
名校
解题方法
9 . 已知
为双曲线
的左焦点,
为直线
上一动点,
为线段
与
的交点.设
.
(1)若点
的纵坐标为
,求
与
间满足的函数关系式;
(2)证明:存在常数
,使得
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfb38ddc1180f5a3d8d63b525d176fdf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b384412acba251d87902ab928902f16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fb26d84907c923278ac4626a9d58947.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6cbb56ca82fec8b087ec1f01a1e805d.png)
(1)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5873c01192b7d33b7483f444f90b5b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/671f43c79d612c93a6d160335e86e177.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
(2)证明:存在常数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/280860dd039e1305a5ccc455f63e8223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fa29cd2e098f4dc3050fa3fd5283264.png)
您最近一年使用:0次
名校
解题方法
10 . (1)已知
,
,点
在线段
的延长线上,且
,求点
的坐标;
(2)若
是夹角为
的两个单位向量,求:(i)
的值;(ii)函数
的最小值;
(3)请在以下三个结论中任选一个用向量方法 证明.
①余弦定理;②平行四边形的对角线的平方和等于其四边长的平方和;③三角形的三条中线交于一点.
注:如果选择多个结论分别解答,按第一个解答计分.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98b2cc0d2f6d3eee9a33db83e0c0830d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dd8a31b5335186eb1bea5c80cddcfd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e490ca1cc66be5a2f1677d243fe093db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8e8b95a61af300412fc65f846089028.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58054eff6c328eb401995a81c6e91a54.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d65f84320b2cea4c64a8254bbceb250.png)
(3)请在以下三个结论中任选一个用
①余弦定理;②平行四边形的对角线的平方和等于其四边长的平方和;③三角形的三条中线交于一点.
注:如果选择多个结论分别解答,按第一个解答计分.
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