在边长为
的正三角形
中,已知
,
,点
是线段
的中点,点
在线段
上,
.
为基底表示
;
(2)求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a623383ae7d18b651deb1d580186fdf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9a4e7a88f8e2c39b557f03461ba22cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.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/62a52e5de7301d28c715d716029951ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b172cf8d898883d82e973f28c3c3a3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0a80d4861b62728f5ed80b0721dd293.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0e35f64aae201a6eee243d398c62d0b.png)
20-21高三上·宁夏·期中 查看更多[5]
宁夏大学附属中学2021届高三上学期期中考试理科数学试题(已下线)练习16+向量的应用-2020-2021学年【补习教材·寒假作业】高一数学(苏教版)(已下线)8.1.2 向量数量积的运算律-2020-2021学年高一数学课时同步练(人教B版2019必修第三册)浙江省宁波市咸祥中学2020-2021学年高一下学期期中数学试题安徽省六安市第二中学河西校区2023-2024学年高一下学期期中考试数学试题
更新时间:2020-11-15 13:00:08
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解答题-问答题
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(0.85)
【推荐1】如图,在梯形ABCD中,AD∥ BC,且AD=
BC,E,F分别为线段AD与BC的中点.设
=
,
=
,试用
,
为基底表示向量
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb84f6fbac102ccf326b2223d69cb7cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a002c2889cff5320cd621a5bd3a42bf7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/deae5171eb718a10261d9b632aa7c2ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a54f1203b17cecce60d726b1db3b5dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bcb140aa73fbe827043dca511ea1335.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/deae5171eb718a10261d9b632aa7c2ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bcb140aa73fbe827043dca511ea1335.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee7b28d9954ebf955945a345dedd4adb.png)
![](https://img.xkw.com/dksih/QBM/2018/12/13/2095916986671104/2102349592141824/STEM/bad658fbde33429bb1be23fc64ed08fa.png?resizew=260)
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解答题-证明题
|
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解题方法
【推荐2】如图,在
中,D,F分别是BC,AC的中点,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/23/07e3f3ee-fe8c-498f-8229-f738a3c5b2e7.png?resizew=141)
(1)用
分别表示向量
,
;
(2)求证:B,E,F三点共线.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b5205b7ddc8166feaba03abc4b14127.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f3adc4ed291596abf3bb93ae7a075d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cc03a3ba496faee748a8d63e5d4fa92.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/23/07e3f3ee-fe8c-498f-8229-f738a3c5b2e7.png?resizew=141)
(1)用
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8e8b95a61af300412fc65f846089028.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d021a5c98388463d577675e58068aa7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba7d3a0680780aaf4549c447fe8dfe9f.png)
(2)求证:B,E,F三点共线.
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名校
【推荐3】如图,点
是
中
边的中点,
.
是
的重心,试用
表示
;
(2)若点
是
的重心,
,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03ba495e8f9fe02229a4248fdbfb4710.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/0b172cf8d898883d82e973f28c3c3a3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ef2723673c90347f6dd58346278c7fa.png)
(2)若点
![](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/96e5e780649c1b7d14332d92d9a4ec6f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3457fa2dc89aea8ff934149efed4c2e8.png)
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解题方法
【推荐1】(2012年苏州17)如图,在
中,已知
为线段
上的一点,且
.
(1)若
,求
的值;
(2)若
,且
,求
的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b8189f7b0ffe4d20bf0fad43b4ed589.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/2e098df0d6924ab59f5aba63d65d6b3b.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84bc6a7f6fc168aa7e9806853fe6b795.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b0fffbec1fe851795dfdd448bf0d165.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df086b80d006c0c5e7d3000021049fae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d162c29b1e484cfc87350dd68f00b85.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b2ea6eb60d9ddf9b489d1e32a7d2270.png)
![](https://img.xkw.com/dksih/QBM/2017/5/10/1683970715353088/1715348022968320/STEM/7700cb7e513c47fa9a9e02ff12064886.png?resizew=252)
您最近一年使用:0次
解答题-问答题
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解题方法
【推荐2】已知
,
是夹角为
的两个单位向量,
,
,其中
.
(1)求
;
(2)若
,求实数
的值;
(3)若向量
,
的夹角为
,求实数
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0411792b587ddd3e04440392f011c224.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b95d660852c5226ff65a21cfb36b8b39.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7761f4748ad80f53e692c63c76dafc1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03b752f11d032d3801b91f016919fb9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71b8e5990ef4ef314941a3154457a9d4.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94d723baf90e91b4691a2dcdd8f2a53e.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/076559f08d17fb25e82886e791719e52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
(3)若向量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a2f4b1178f68bd147d1a2a6acd04435.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c94075193c11fe43f2396cff5a485054.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6c0927afc571a7c966c98192040979e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
您最近一年使用:0次
解答题-问答题
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解题方法
【推荐3】已知向量
,
满足
,
,且
.
(1)求向量
,
的夹角;
(2)求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64c5562bd4d1b54424330cb6329cd79d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b45ba716f03748c19b7ce2f99af536ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29276b43a2950ed71f0f9629a35dfa74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ff265969988f1f138700129e5d7a6d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/192265ae3ba51cff02557419d30f4912.png)
(1)求向量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64c5562bd4d1b54424330cb6329cd79d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b45ba716f03748c19b7ce2f99af536ab.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de0212ab68627919b1d22ac348a3e849.png)
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