题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015526-63139.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015526-92517.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015526-50649.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015526-28149.png)
(1)若
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015526-63139.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015527-76287.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015526-50649.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015527-14329.png)
(2)若
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015527-63050.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015527-52375.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015528-53391.png)
答案
解:(1)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015528-20169.png)
(2)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015528-73474.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015528-36141.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015528-98521.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015529-88085.png)
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015526-63139.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015527-76287.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015526-50649.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015529-49775.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015528-20169.png)
(2) 由
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015527-63050.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015529-86805.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015530-13512.png)
可求出
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015530-46079.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015528-53391.png)
解:(1)因为
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015530-21594.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015529-49775.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015530-45695.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015528-20169.png)
(2)由
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015527-63050.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015529-86805.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015530-29474.png)
从而
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015531-48447.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015531-57979.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015531-19224.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015530-13512.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015531-41231.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015532-50790.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015527-52375.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015532-49752.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015528-73474.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015528-36141.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015528-98521.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015529-88085.png)
核心考点
试题【(12分)知向量=,=. (1)若,求的值; (2)若,,求的值.】;主要考察你对平面向量的基本定理及坐标表示等知识点的理解。[详细]
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015519-40590.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015519-95684.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015519-64687.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015519-40233.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015520-82033.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015513-99232.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015513-87631.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015513-86598.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015513-87631.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015513-52006.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015513-34233.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015514-88171.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015514-33722.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015514-92284.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015513-87631.png)
A.点![]() ![]() | B.点![]() ![]() |
C.点![]() ![]() | D.点![]() ![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015507-81205.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015507-67995.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015508-11649.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015502-21446.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015502-46623.png)
A.3 | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015457-75388.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015457-91253.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015457-25524.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015458-75182.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015458-85307.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015458-87386.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104015458-12757.png)
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