解题方法
1 . 已知向量
,
,若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6c57bbef89a37f1a3808c0ceeac0c22.png)
____________ ,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/339207abc7d50c3375e06a1a68b5cb18.png)
____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d607667f2516c58bbdff03e01be50f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7736c6ef21c4dd216656b4f8076075b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4adc0409d4aebb7d0b9fb1bc757f6d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6c57bbef89a37f1a3808c0ceeac0c22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/339207abc7d50c3375e06a1a68b5cb18.png)
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2 . 已知
,
,若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/526f14159b175717af65b9eab2149e34.png)
_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/108d0b1faec669d423428824d9097848.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b05f8a61e0eacb8f9052b037f22de340.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16fd80cb298798c0bdc88e0a285416bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/526f14159b175717af65b9eab2149e34.png)
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3 . 已知向量
、
满足
,
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9db0f724f732c7a64d9a2212911d88f3.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/59f089a9e08ceb59cb58d7a5be2f62e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa421b5d6a9573231702019f12480eb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a874e0c387b42adf85448f63b788baa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9db0f724f732c7a64d9a2212911d88f3.png)
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名校
4 . 等腰直角三角形ABC中,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a552662936e43569aabe432c66ef4d40.png)
,则有![](https://staticzujuan.xkw.com/quesimg/Upload/formula/203df3c5a3e46a0566cbe3f9f630ad18.png)
________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a552662936e43569aabe432c66ef4d40.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47a9169fcd233a32ceeaa307dc6e4cad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/203df3c5a3e46a0566cbe3f9f630ad18.png)
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2020-01-29更新
|
725次组卷
|
5卷引用:2020届安徽省池州市高三上学期期末考试数学(理)试题
5 . 矩形
中,
为
的中点,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a20da9a5b0073e4a61d6c53c661bf8ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6f268b01cb4eb37f350012af63e572e.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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2020-01-28更新
|
283次组卷
|
2卷引用:2020届河北省张家口市高三上学期期末教学质量监测数学(文)试题
6 . 已知平面向量
,则向量
与
的夹角的余弦值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c3b5624ddc28dc4f8ba227f3b48da13.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/969604545902c9a66549a4a44ec3a3c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90ab17fd4247cdd710c363d5d3fbc5bd.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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2020-01-28更新
|
632次组卷
|
5卷引用:安徽省阜阳市2019-2020学年高三教学质量统测数学(文科)试题
名校
解题方法
7 . 设
,
是平面内的两个单位 向量,且夹角为
,则
等于( )
![](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/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78a88fc5b2265365ebadbc539822612a.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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8 . 在
中,
,
,且点
满足
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/640739b722da719e49217d5ff53ac857.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4e47aeadb9a315349df2a905487d2f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31caad7f0b59be9c92c2f3ed9d66ebf9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/640739b722da719e49217d5ff53ac857.png)
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2020-01-24更新
|
538次组卷
|
2卷引用:2020届广东省茂名市高三第一次综合测试数学(理)试题
9 . 已知向量
和
夹角为
,且
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/981762ab05e45eb077a7e0f14598b4f2.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/231b861d6d1f1d0b9f52b041cb40eb62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59f089a9e08ceb59cb58d7a5be2f62e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fbcc0fa4b480c43e9a66273898c9a60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/981762ab05e45eb077a7e0f14598b4f2.png)
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名校
解题方法
10 .
中,
边上的中线为
,若
,
,
,
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.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/1dc2c62290eb2fb969f9dd68d3d99d82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/325ba8093bd40f00a79e3c49010ea704.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f1c860866dcbfab18185e7400875a2a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7b19819443514c14e3133a657941198.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4abd947918fc8f9d06ebe8c204f25821.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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