已知
是同一平面内的三个向量,其中
.
(1)若
,且
,求
的坐标;
(2)若
,且
与
垂直,求
与
的夹角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae951e0bb5a2a406f1572fc1e4964265.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a41db77023038261efff763ee859f266.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/170eb19a07253d6fa6d1b750ce66d637.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82fc5e3b3e4a43f05fe43be51a2a1163.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d366d8fbb7258ee051f49977441e14a2.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8febc305ff560626bdb55735a5085128.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9cd8bbf47b69bbd7a6263b041290d11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a06c8eae3652486cf9e416ce3a8ffc9.png)
![](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/c24095e409b025db711f14be783a406c.png)
更新时间:2022-06-24 13:40:45
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【推荐1】已知平面向量
且![](https://staticzujuan.xkw.com/quesimg/Upload/formula/016e4d15ab8f5359f6aa3b42674b0c13.png)
(1)若
,求
的值;
(2)若
与
共线,求实数
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b172cf8d898883d82e973f28c3c3a3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/016e4d15ab8f5359f6aa3b42674b0c13.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3ebbbf2acf1a2c437499ab43117e3c8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6849424bb49758b9c55fec214eef565.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97b43fb9b4bf8e9eee69791363e6f8fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bca35e52b8430246a1cf96e9e617cce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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【推荐2】已知向量
.
(1)若
,求
的值.
(2)设
,向量
与
的夹角为
,求
的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba5cd28f5401f9c5cee53caf5a14263a.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91b958a367fa2f08b6202a5a6ebf5e9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a603069cf81f5ff7a40bc24e1be8be7.png)
![](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/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
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【推荐3】平面内给定两个向量
,
.
(1)求
;
(2)若
,求实数
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f89d9cd2d59f0d0366e64469ad376b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67584e2063b8190b096eda30501e596b.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/022030927a837bf502d1847da4e15dc9.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/963c419fc22125db316ecd3dd3a83a84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
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【推荐1】已知
,
,
.
(Ⅰ)求
与
的夹角;
(Ⅱ)
时,求实数
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43f15cf22cc6a5cb35d5154f7a37c7a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d3eab962bfddbb688c9bf843f0f1b00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ef5d86fbe69aa4b87de29aaa2aa8866.png)
(Ⅰ)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb80eb942aafb194fadc473776f35b1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/433b94c39737727e53468df419d8314a.png)
(Ⅱ)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e725992a5c3593260fcdb53493901d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
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【推荐2】已知向量![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c793e081d23dedc02097553fffb6e3b.png)
(1)若向量
和
的夹角为
,求
;
(2)若
,求向量
与
夹角的余弦值
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c793e081d23dedc02097553fffb6e3b.png)
(1)若向量
![](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/ac1a63ab608517bb10aa036783dfb51f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93af88a7628c71d642d3a6df067c15f5.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/684ca0e4a2c1b4d2a0058375dcbcdd17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64c5562bd4d1b54424330cb6329cd79d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b45ba716f03748c19b7ce2f99af536ab.png)
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【推荐3】如图,在平行四边形ABCD中,
,
,
,
,
与
的夹角为
.
![](https://img.xkw.com/dksih/QBM/2022/5/27/2988632120131584/2989347033554944/STEM/7fc29234-897a-4912-888b-fb9050e2d757.png?resizew=200)
(1)若
,求x,y的值;
(2)求
的值;
(3)求
与
夹角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57347a69920bc0db9e652a9141091ff7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/defad6a6cfa5b7909fba1ebca5f67d0c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f69010559175d74d87c3bef433b7baab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1ca19c71505ec8fea00b0aaff4d2b78.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9795e7f5cb9b366776c41d8f3f43942.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bd98a891fa65f2fc6688001b03185d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d88591679796c52024d11c4de641bdb.png)
![](https://img.xkw.com/dksih/QBM/2022/5/27/2988632120131584/2989347033554944/STEM/7fc29234-897a-4912-888b-fb9050e2d757.png?resizew=200)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63104f80571dbeaf95ce925e9cbaafe7.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3728d1c17bd92866025193c752121a7.png)
(3)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be64d59ac6538a0f4d79fb825e082081.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75f90e16e18b1e88ebb1ab811d06be76.png)
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解题方法
【推荐1】已知
,
与
的夹角为
.
(1)求
与
的值;
(2)x为何值时,
与
垂直.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/059a8ea5cd70716f6e1b1a89288bd592.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/231b861d6d1f1d0b9f52b041cb40eb62.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce70b2d36f45ebb05daf7fb932a10494.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27c250094127e2b3c878d68213b60407.png)
(2)x为何值时,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ffa93e6d85e37a5dd4cf2e779080c536.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f04039292017b48bb2232442e4511c1.png)
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【推荐2】已知
三个顶点的坐标分别为
.
(1)若
是
边上的高,求向量
的坐标;
(2)若点E在x轴上,使
为钝角三角形,且
为钝角,求点E的横坐标的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/167b896307be0b7425fff73c8d71f4b0.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d036188ce294e3c7427d0b7d2294fd2.png)
(2)若点E在x轴上,使
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89e8c3cf4bbfa6e00d38761560ddc6b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6282292819434a8905a212427613fd85.png)
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【推荐1】已知向量
,
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c00aba0b861e8b531c5408de2d8301c2.png)
(1)求
在
方向上的投影向量的模长;
(2)若
与
夹角是锐角,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85bda836140fd29f8f2444ed86924aec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59445ef1f4e20b8d9324f82d550b9ed7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c00aba0b861e8b531c5408de2d8301c2.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb80eb942aafb194fadc473776f35b1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb573cc0f30d5c32cdad1510793f0e7b.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/977401a9945ccd602826b5cdfc0c45af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3a1ba3ffa0279c1be9a9ea5b6df68ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
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【推荐2】已知向量
的坐标,分别求
,
,
和
.
(1)
,
;
(2)
,
;
(3)
,
;
(4)
,
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b172cf8d898883d82e973f28c3c3a3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c39d1d88189726ae99c309644fca3494.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94d723baf90e91b4691a2dcdd8f2a53e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc7d8b42c85013ba07ba18e5e46d8716.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd4ba3633b075f0f14746c85577d45e7.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51cb17403fe59a0e1a93df381aed40cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f025cf13067736ab6069d5876a76cb44.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbaa8118fb1abd096659224e4f514c6c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bb2defdffb00113c928fc2d639de294.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6151bb82012ca19ca2fd68b09153a9b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66de249b7c29faff4f8ff786ba21d500.png)
(4)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a74783979ac376d7c56a0f3502eb6846.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05c7176c3e8c262f8fe27088b27e57e8.png)
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【推荐3】已知
.
(1)求
;
(2)当
为何值时,
与
平行?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89d3fc72d4a0fb653ec4d58089d5e188.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bd764def6a96d1f2abd3b89580c5352.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b0d6f45010a54e0bfa0b48c90376ebb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d31b07a2081bfaaf77c0062193ab173e.png)
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