已知梯形
中,
,
,三个顶点
.
(1)求顶点
的坐标;
(2)求
在
上的投影向量.
![](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/12143a06ed24558d8cc7ad39961d3e1f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2355bdbecddb154d23cd775e258d4208.png)
(1)求顶点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abcb5d89b04570ceda2c29e11cb27a57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/304a7f07db2ec637baadf8f0ab91c85c.png)
更新时间:2023-08-07 15:41:22
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【推荐2】已知半圆圆心为O点,直径
,C为半圆弧上靠近点A的三等分点,若P为半径OC上的动点,以O点为坐标原点建立平面直角坐标系,如图所示.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/30/e61ba4ba-e33d-43e4-b91b-293427d4ea46.png?resizew=174)
(1)求点A、B、C的坐标;
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(3)试求点P的坐标,使
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/30/e61ba4ba-e33d-43e4-b91b-293427d4ea46.png?resizew=174)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/876abd1dec09580c08d8f7e1c85dffcd.png)
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【推荐1】已知向量![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33e9d5baa938c2b7958afb29426db937.png)
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【推荐2】平面内向量
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解题方法
【推荐1】已知平面向量
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3fa4c83c4204fe667ff3a4805761fe5.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7dced91de1b8c38aa95ffee0e5dc202.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c75a15198f2465863fd46e0794d0bf2.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd876a2ed79c64bacc3e64b8ee92735e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9cd8bbf47b69bbd7a6263b041290d11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a2f4b1178f68bd147d1a2a6acd04435.png)
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(1)求
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(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff959fd97e7ad214e07e136563e70bf9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58f643fdcdb4f0f26ba4746b7b550490.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97a0af198dd7538d867c7fa1facdd06d.png)
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解题方法
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