已知两向量
的夹角为
,
.
(1)求
的值;
(2)求向量
与
夹角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b172cf8d898883d82e973f28c3c3a3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/231b861d6d1f1d0b9f52b041cb40eb62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64eedf812697df46af4e346fd5fbc882.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ed9a5dc78f375f6e7a2a6e3fde474d0.png)
(2)求向量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/313fdae925557019ce17b5da5a1c4259.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64c5562bd4d1b54424330cb6329cd79d.png)
22-23高一下·陕西榆林·期中 查看更多[3]
陕西省榆林市定边县第四中学2022-2023学年高一下学期期中数学试题陕西省榆林市定边县第四中学2023届高三上学期10月月考理科数学试题(已下线)专题03 向量的数量积(题型专练)-《知识解读·题型专练》(人教A版2019必修第二册)
更新时间:2023-07-30 21:39:11
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【推荐1】已知平面向量
,
的夹角为
,且
,
.
(1)求
;
(2)若
与
垂直,求实数
的值.
![](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/8febc305ff560626bdb55735a5085128.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e16d81d266f24698696a81ed5e007680.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88838b44f67d94e6ea3347a208b37ccc.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9cd8bbf47b69bbd7a6263b041290d11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bff01c3e3b53271c5d16ad4e02a930ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
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【推荐2】如图,点P是角
的终边与单位圆的交点,点Q是角
的终边与单位圆的交点,其中
.
(2)求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a03fb21c8b2e63f2861bfa8278283b75.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4065bab5c4a3de754b7d8837b4a1c12.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba641f692cfac23684a3f2ab2ac86e56.png)
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【推荐1】试比较复数运算与平面向量运算的异同,谈谈你的感受.
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【推荐2】已知向量
,
满足
,
,且
,
的夹角为
.
(1)求
;
(2)若
,求实数
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/c7958a6bddd1d578bbd6fbcb92e3f6a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2396cac4b185cf1f1a67dad9248481c.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/ac1a63ab608517bb10aa036783dfb51f.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12852bf114fc1d03484bba73a571acca.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ba16b8d0d5335351472d3adef44914a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
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【推荐3】已知点
,
,
满足
.
(1)求m的值;
(2)设O为坐标原点,动点P满足
,求当
取最小值时点P的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32366143230ca122894a4bada7c7b96d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1282cc43ebf4b459832fec04d805989.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/458ee4d93e21ec4ded0a7635b1feeeaa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/176716e96fb04f8cc77df3b45ec1fbd0.png)
(1)求m的值;
(2)设O为坐标原点,动点P满足
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97cb92e05ae00db42df19282dc942a28.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f0e6d3115e900f1a359ec4f894e8896.png)
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【推荐1】记
、
、
为平面单位向量,且
.
(1)求
;
(2)若
,求
.
![](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/73a0b19e69be46452425916a0fcb49c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e49ef047ee5a1b9a88442b038b18f995.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7be4359335d6e4f961bf1913d47b904.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9da3bd10556c5d9afa0278c6673533.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d2c935704ff6b53ac9c6d4dc48485ed.png)
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【推荐2】已知
夹角为
,且
,求:
(1)
;
(2)
;
(3)
与
的夹角
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b172cf8d898883d82e973f28c3c3a3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6c0927afc571a7c966c98192040979e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81e906b18a41180399697862e474627b.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b195aa36a3c2753ebf08cb464c52ad1e.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0081237674b159a7532c7f178986ce80.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a2f4b1178f68bd147d1a2a6acd04435.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e62efe57c935c50057c90ed8e45d387.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8505aaf8a003faa6051bbd1edaa5ee91.png)
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【推荐3】已知向量
、
的夹角为
,且
,
.
(1)求
的值;
(2)求
与
的夹角的余弦.
![](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/2d88591679796c52024d11c4de641bdb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70e310702748855c3edccd151aae0143.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b113dc271cf51b3018bd1de14edf73ad.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b195aa36a3c2753ebf08cb464c52ad1e.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a2f4b1178f68bd147d1a2a6acd04435.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9cd8bbf47b69bbd7a6263b041290d11.png)
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解题方法
【推荐1】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)
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【推荐2】(1)设
,且
与
的夹角为
,求
的值;
(2)设
,求
与
的夹角
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89855afc2bc84246edc945e9aee4dcc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/969604545902c9a66549a4a44ec3a3c6.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/260200d547998bcac50a4a491382e7f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63d7a384a4a983a7aed3294e7a6c839.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83104d359c66235411402120e474f915.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/969604545902c9a66549a4a44ec3a3c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90ab17fd4247cdd710c363d5d3fbc5bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
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