已知
当
为何值时,
(1)
与
共线;
(2)
与
的夹角为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b17c094e43f2a98194e80a4e055e9a0e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b0d6f45010a54e0bfa0b48c90376ebb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9cd8bbf47b69bbd7a6263b041290d11.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfd0f75a47e294603ffa1437fbc501e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9cd8bbf47b69bbd7a6263b041290d11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
更新时间:2023-04-17 08:06:02
|
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解答题-问答题
|
较易
(0.85)
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解题方法
【推荐1】已知向量
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc81c9ec2d34cb2ddeb4391216fd5300.png)
(1)若
,求
;
(2)若
,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94cdd34c3b7a4bb5b338e7b4c79353b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc81c9ec2d34cb2ddeb4391216fd5300.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02b4138615f8fcf33e6e21e0d4f1f3b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1b6aadc2a7fc75b826fc7cc907b715a.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9fd98adf04698b8252925545a601218.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43660b1543b3a2b46185f7629d28a963.png)
您最近一年使用:0次
解答题-问答题
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较易
(0.85)
解题方法
【推荐2】如图,在△
中,点
是
的中点,过点
的直线分别交直线
,
于不同的两点
,
,若
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef92978f61da132f247678562cecd97d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fd1f0ace9ca0b79929e73af6c201c2e.png)
![](https://img.xkw.com/dksih/QBM/2021/4/19/2703265087676416/2706743177510912/STEM/16bdeea7-70bc-47ac-9a7d-2af5fc97a878.png)
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解答题-证明题
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较易
(0.85)
【推荐1】已知
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47e5033db72e6c6360373ba944708cbc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4e4c210b2342523b23a43e0a5fd4f63.png)
您最近一年使用:0次
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【推荐2】设
为坐标原点,已知向量
,
分别对应复数
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,且
,
,
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a72ff93c6b79f395aabb9f25e45203d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95985232e68bbf4e37f147d89efbfed6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af68f652b4c13657ffddf3c9e7eb262b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa224ed9be8766a4d0b5138bd57de0f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e51a900aa3fcb3e1a4d6c132e6dc1259.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/787d89f8bdffc858b51bd795157161af.png)
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