已知平面向量
满足
,
,且
的夹角为120°.
(1)若
,求实数k的值;
(2)计算
,
夹角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8ccba3b87a8a48ac3dd5f72d00bdb1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a04a5b951b6ce6c766a63e7a077e02c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8136fd1d44b6d4c32a1b57c2da0ccdb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8ccba3b87a8a48ac3dd5f72d00bdb1a.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83347bd3b62805dfdab78493cbdeb709.png)
(2)计算
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7e07c25df57a36d4f1b11d7d9fe16b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73b91254db5ff748150f449c5cdd256c.png)
21-22高一下·安徽亳州·阶段练习 查看更多[2]
安徽省亳州市利辛县第一中学2021-2022学年高一下学期4月联考数学试题(已下线)6.2.4 向量的数量积 (精讲)(1)-【精讲精练】2022-2023学年高一数学下学期同步精讲精练(人教A版2019必修第二册)
更新时间:2022-04-30 16:55:43
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【推荐1】
的内角
的对边分别为
,若![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a33707114f9e8d36ec51243c5c3f4153.png)
(1)求角
的大小;
(2)若
,求
的周长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a33707114f9e8d36ec51243c5c3f4153.png)
(1)求角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d66142ffac671048e526bcea5daf3eb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
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【推荐2】在
中,角
的对边分别是
,满足
,
,过
作
于点
,点
为线段
的中点.
(1)求
;
(2)求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c04a91808dc16916834d40d430d0e4c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f5a58aded55ecd83f8a57a8c98706d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70734a8e672376bb0bd1522e229f86a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ab331ad75601ee381351d5ceaa4d086.png)
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【推荐1】如图,在梯形
中,
,
,
,
,
在线段
上,
.
![](https://img.xkw.com/dksih/QBM/2021/4/28/2709546294026240/2761264766197760/STEM/670493c9-d13e-4f04-a828-2f56d67d3ad0.png?resizew=238)
(1)求△
的面积;
(2)求
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f79863ffcfa63117ca6741b20a48e69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f08273d339dc5ddbb89aa67bb8205e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc11331a7b2d2619b40ee6d34c3bd620.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16ed75e65e7374c38ffb1f75259a8beb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfc1f76257275ab4b04f9bc913535670.png)
![](https://img.xkw.com/dksih/QBM/2021/4/28/2709546294026240/2761264766197760/STEM/670493c9-d13e-4f04-a828-2f56d67d3ad0.png?resizew=238)
(1)求△
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10c6ee63b22008f64730404a63967d11.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f58d96bcd3fc1fa4ad2d4c5987f70a59.png)
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【推荐2】已知平面向量
,
的夹角为150°,且
,
.
(1)求
在
上的投影向量;
(2)若
与
垂直,求实数k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/42cd179fd73e37fce5db6838459b10b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/005090546ca251b4e9974badd2ee090b.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a2f4b1178f68bd147d1a2a6acd04435.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c94075193c11fe43f2396cff5a485054.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9cd8bbf47b69bbd7a6263b041290d11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bff01c3e3b53271c5d16ad4e02a930ad.png)
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【推荐1】设向量![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5256815be54e9757f0e1503e4293d3b.png)
(1)求与
垂直的单位向量;
(2)若向量
与向量
的夹角为钝角,求实数t的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5256815be54e9757f0e1503e4293d3b.png)
(1)求与
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9cd8bbf47b69bbd7a6263b041290d11.png)
(2)若向量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12dfa2b2e9488107d07fdac71f433774.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edc20644e220b5abd6ca29a666760dfe.png)
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【推荐2】已知
、
是同一平面内的两个向量,其中
,
.
(1)求
与
的夹角
;
(2)若
与
的夹角为锐角,求实数
的取值范围.
![](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/81f4dcf415977dea53f52a85b6b82136.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6f99645c5aa5800b219c4d9f0baebcd.png)
(1)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/c24095e409b025db711f14be783a406c.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64c5562bd4d1b54424330cb6329cd79d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba2b0627ff70b02aa16b007dc41794dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
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【推荐3】已知向量
,
是平面内两个不共线的单位向量,C为平面内一动点,且
,
.
(1)若P为OC的中点,求向量
与
夹角的余弦值;
(2)若|
|<
,求|
|的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d60dcb171bb7fd972aab8294d63acdb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f68628a408537b1cf3bf1ca2a69731b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cbf54c397e8d85e7ba255732b86439a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab8a6d8cc0bba5c3bbfabfc2b41e28c9.png)
(1)若P为OC的中点,求向量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d60dcb171bb7fd972aab8294d63acdb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f68628a408537b1cf3bf1ca2a69731b6.png)
(2)若|
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cec64476aaca08de0808afda3618109c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d20ec3efaa6b6ff5769e8999df5714a9.png)
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【推荐1】在
中,已知
,
,P在线段BC上,且
,Q是边AB(含端点)上的动点;
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/2/67880cdc-effe-40b8-8d2c-65d948778ef9.png?resizew=151)
(1)若
,O是AP中点,求证:C,O,Q三点共线.
(2)若存在点Q使得
,求
的取值范围及
的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d70dc2c20619a4fc12a0cfda59af5b69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89f8c7c5dad20d1ac791b5aaad95c31b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/2/67880cdc-effe-40b8-8d2c-65d948778ef9.png?resizew=151)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad5e54f557d62b594cc86f80b4bedf1c.png)
(2)若存在点Q使得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55711dc230f1ca9e948288d5a2cc793c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5cb63aeea0b37799404c8fec092b21d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee0e611318ee3f01b95ba8f2188cb8bc.png)
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【推荐2】已知向量
,
,且
与
夹角为
,
(1)求
;
(2)若
,求实数
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71f60453488ea71a6b6bd24e7db81be2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/404067afb19bd74f447a6c0c832af1da.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/c0211da37e92f915e781691296578ba0.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de0212ab68627919b1d22ac348a3e849.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86005984bdd5315aa7c234895f375a4b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
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