名校
1 . 设
不共线,且
.
(1)若
,求证:
三点共线;
(2)若
三点共线,问:
是否为定值?并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/870621330877caa08df79df91fc4ff4a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e1ba5acc2c716d8a3d36de3b6a3ca87.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46c0ec201ece369cea29b016bdfe50bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20d6fc9b90f370fbb27552876b650f8f.png)
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2018-01-06更新
|
837次组卷
|
5卷引用:人教B版(2019) 必修第二册 过关斩将 第六章 6.2.1 向量基本定理
人教B版(2019) 必修第二册 过关斩将 第六章 6.2.1 向量基本定理沪教版(2020) 必修第二册 同步跟踪练习 第8章 平面向量 8.3.1平面向量的分解定理沪教版(2020) 必修第二册 同步跟踪练习 第8章 8.3.1 向量基本定理江苏省南通市海安高级中学2016-2017学年高一下学期期末考试数学试题(已下线)2017-2018学年第一学期期末复习备考之精准复习模拟题高一江苏版数学试题(A卷)
2 . 如图,平行四边形ABCD中,点M在AB的延长线上,且BM=
AB,点N在BC上,且BN=
BC.求证:M、N、D三点共线.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
![](https://img.xkw.com/dksih/QBM/2018/2/21/1887073718788096/1890074568851456/STEM/eb1b66842beb4bdb8e9ab4704e4b0fb2.png?resizew=172)
您最近一年使用:0次
3 . 已知
为原点,
、
、
为平面内的三点.求证:
(1)若
、
、
三点共线,则存在实数
、
,且
,使得
;
(2)若存在实数
、
,且
,使得
,则
、
、
三点共线.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.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)
(1)若
![](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/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3999cdc37dd36b630ccfd72bd36e9f96.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc0faa9202451fe5a08989ba3637ac16.png)
(2)若存在实数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3999cdc37dd36b630ccfd72bd36e9f96.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc0faa9202451fe5a08989ba3637ac16.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)
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2014高三·全国·专题练习
解题方法
4 . 已知点
是
的重心,M是
边的中点.
(1)求
+
+
;
(2)若
过
的重心G,且
,
,
,
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2b83beedb3438153e6f728545fe3e03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bf1ea09767968c5aa42908fd2c869a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79bf5928ac2dbab1c6463915d50268b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0cc4537af4f7313461335a93b8ac5fa.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2b83beedb3438153e6f728545fe3e03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14390e9b6b44472bdc7a131133ab39b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87cd14dfc0024459f9d8e594c95c5106.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ffc83b8da957d44914586bc8de343b35.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba92d0f37859b5c9a8b5ce6a2391661d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3288630168d66493e57dd88c96c36d93.png)
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