2020高三·全国·专题练习
解题方法
1 . 在
中,
,设点
满足
,
,
.若
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1a5a6dbca66f0aad2c3d8894ee9a67a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6bce3d91ca23b86d8c6625f2632e437.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f5384b755a2b0f960606cd61832aa59.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78170a08c4ad390327a1a7c67b35a7d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bd9736828195f010db4e1f0a9dea7a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dab5ef44ea9eda6acf04add072d12c1c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5085e3cdef9ea6c564e079f745d6fdb.png)
A.![]() | B.![]() | C.![]() | D.2 |
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21-22高一·江苏·课后作业
解题方法
2 . 已知
是非零向量,
为实数,设
.
(1)当
取最小值时,求实数
的值;
(2)当
取最小值时,向量
与
是否垂直?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8ccba3b87a8a48ac3dd5f72d00bdb1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03cdea171444bd249bc3028dc18cd7ff.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40e9e38e6f1ee74fa3b2489f742878ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40e9e38e6f1ee74fa3b2489f742878ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/433b94c39737727e53468df419d8314a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de8632651e05bbebcc3e7f6fd0a9d27e.png)
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3 . 如图所示,已知
是菱形,
与
是两条对角线.求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfc1f76257275ab4b04f9bc913535670.png)
![](https://img.xkw.com/dksih/QBM/2020/2/2/2390465596506112/2391700167761920/STEM/23d9ac508a0b45de8ef6618fa6c50785.png?resizew=206)
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