解题方法
1 . 已知向量
,
,且
∥
,则
的值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e5d4af9e447f5437018b6b2067218a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c7d8eb0bda4b035cdf29262b58d9ba3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a2f4b1178f68bd147d1a2a6acd04435.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/433b94c39737727e53468df419d8314a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
A.10 | B.![]() | C.![]() | D.![]() |
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2 . 如图,在△ABC中,已知AB=4,AC=6,点E为AB的中点,点D、F在边BC、AC上,且
,
,EF交AD于点P.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/3/2d3a1d5f-9b78-4a74-847a-fc02b423717f.png?resizew=144)
(Ⅰ)若∠BAC=
,求
与
所成角的余弦值;
(Ⅱ)求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e34b7bdcb66019120605fda6acff953b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af51a0a4b6d2aa187d83efe877802f43.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/3/2d3a1d5f-9b78-4a74-847a-fc02b423717f.png?resizew=144)
(Ⅰ)若∠BAC=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d88591679796c52024d11c4de641bdb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d036188ce294e3c7427d0b7d2294fd2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a449b69791ba25c6eed7d71fe508fdb.png)
(Ⅱ)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb5391d00655e9e4ee30fe9934b2f02c.png)
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名校
3 . 已知平面向量
,
,且
,则实数
的值为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09225b5daaf05cdfae8dd857625b3507.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8527f22b1b047dffea143540020f012.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/915f89bdf34798199619c576b502f3d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2019-10-22更新
|
653次组卷
|
8卷引用:湖南省郴州市2018-2019学年高一下学期期末数学试题
名校
4 . 在
中,
,
,
,点
满足
,则
等于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b57fdd2a3642716fcf5100011eb3ec88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8a7b5adfcac0f46a4cd19da4ebb4a2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/136463afb57f44e231d3747140fb026b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f605cc66b879d934062713c8450ee30d.png)
A.10 | B.9 | C.8 | D.7 |
您最近一年使用:0次
2019-09-23更新
|
833次组卷
|
9卷引用:【市级联考】湖南省郴州市2019届高三第二次教学质量监测数学试题(理科)
【市级联考】湖南省郴州市2019届高三第二次教学质量监测数学试题(理科)【市级联考】湖南省郴州市2019届高三第二次教学质量监测试卷数学(文)试题广东省深圳市宝安区2018-2019学年高二下学期期末考试数学理试卷2019届湖南省岳阳市第一中学高三第二次模拟数学(理)试题广东省深圳市宝安区2021届高三上学期期末调研(9月开学考试)数学试题(已下线)专题14 平面向量-2020年高考数学(理)母题题源解密(全国Ⅰ专版)(已下线)专题14 平面向量-2020年高考数学(文)母题题源解密(全国Ⅰ专版)(已下线)第19练 平面向量的综合应用-2021年高考数学(文)一轮复习小题必刷河南省驻马店市新蔡县第一高级中学2021-2022学年高三上学期11月月考文科数学试题
解题方法
5 . 如图为平行四边形
为
的中点,
分别为
和
的三等分点(
靠近
靠近
),设
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a34a6c233c2c83df18693df9c65186b.png)
__________ .(用
表示)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/295fe3b9478bf2e96f42e165e20013a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7789a500686c7a73770404ead6af0590.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/898db7807a160f0c7b17e68615699a07.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b2faa5a3628116566692c970b51984a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a34a6c233c2c83df18693df9c65186b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b172cf8d898883d82e973f28c3c3a3e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/17/6e642bdf-3db5-4280-ab98-c16697505100.png?resizew=162)
您最近一年使用:0次