已知在△
中,
、
、
分别是
、
、
的中点,求证:
、
、
交于一点.
![](https://img.xkw.com/dksih/QBM/2016/11/22/1826270137278464/1826270137835520/STEM/7cff028aa1014d95904cc141bb40ea80.png)
![](https://img.xkw.com/dksih/QBM/2016/11/22/1826270137278464/1826270137835520/STEM/a0b1cfcf53bd4e4db85c6fbb925a6d6f.png)
![](https://img.xkw.com/dksih/QBM/2016/11/22/1826270137278464/1826270137835520/STEM/9cc5fde615bf4ab0989e13657ead2c86.png)
![](https://img.xkw.com/dksih/QBM/2016/11/22/1826270137278464/1826270137835520/STEM/b0dd56020acd4f23909beb8da1ef2815.png)
![](https://img.xkw.com/dksih/QBM/2016/11/22/1826270137278464/1826270137835520/STEM/8c99da3d59da4efb9e39fb9f87f9d21f.png)
![](https://img.xkw.com/dksih/QBM/2016/11/22/1826270137278464/1826270137835520/STEM/bc7c6d9787944ba8857e3d6b37f97e02.png)
![](https://img.xkw.com/dksih/QBM/2016/11/22/1826270137278464/1826270137835520/STEM/20d26933f9504aa6bb95760725dfef30.png)
![](https://img.xkw.com/dksih/QBM/2016/11/22/1826270137278464/1826270137835520/STEM/612f62d0f4764d39954b2151251646b2.png)
![](https://img.xkw.com/dksih/QBM/2016/11/22/1826270137278464/1826270137835520/STEM/7e068e4c842c45abbf78019fa54e958e.png)
![](https://img.xkw.com/dksih/QBM/2016/11/22/1826270137278464/1826270137835520/STEM/b664f5fb1372476aa2a6b04a72600cfa.png)
2016高一·全国·课后作业 查看更多[2]
更新时间:2017-11-27 15:39:01
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【知识点】 平面向量基本定理的应用解读
相似题推荐
解答题-问答题
|
适中
(0.65)
名校
解题方法
【推荐1】在平行四边形ABCD中,边
,
,
,若M,N分别是边BC,CD上的点,且满足![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6c144e9b7986f74a0e45eff488b1304.png)
.
(1)当
时,若
,求
;
(2)试求
取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f4aca5534bce25acaeb7379deed8f8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7dbf31dfd36aa456a63bafea8bc1985.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6c144e9b7986f74a0e45eff488b1304.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd2e48341bf9ce1d6ba26b31616f97b0.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3a2a34b4317deffa40ba34e269c2b81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a42b8a4e130af974aa5ebfc487fbe8a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8dc4c63a548b91061528aa11058de75.png)
(2)试求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd92ed9c7d216873545ea59101b6ce1b.png)
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解答题-问答题
|
适中
(0.65)
名校
【推荐2】在
中,底边
上的中线
,若动点
满足
.
(1)求
的最大值;
(2)若
为等腰三角形,且
,点
满足(1)的情况下,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc11331a7b2d2619b40ee6d34c3bd620.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a930364a80a61992b44287a7d5e028ae.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/374447fd9de3d4163b026f08eb253f1d.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f08273d339dc5ddbb89aa67bb8205e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e778fcd92a0c8890b5cd7bed0615486.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐3】如图,在△ABC中,已知
,
,
,BC,AC边上的两条中线AM,BN相交于点P.
;
(2)求
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3ad4c0ba3a6750537789844d0ec419d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b57fdd2a3642716fcf5100011eb3ec88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/910ea025d81c73be8bba38577e83ddcd.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c45a8a837c11c07073da3ff751d70278.png)
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