名校
解题方法
1 . 在
中,内角
所对应边分别为
,则下列说法正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
A.若点![]() ![]() ![]() |
B.若满足![]() ![]() ![]() ![]() ![]() ![]() |
C.若点![]() ![]() ![]() ![]() |
D.若![]() ![]() ![]() |
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2 . 在平面内,设
,
,
,
,
,
,
,则以下结论正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/420ad6159fc091d6a5ffddf0676d2662.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4f8173bb7787b6b107acfe767dd1d91.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df562e0b5e79dc61601aa6666e6f516d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf9fde879db30f15083c0c342638c3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d8c00d9c20e83cb187ab992771ec651.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e16d81d266f24698696a81ed5e007680.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa363070e9ec729ceb37e480e3552836.png)
A.![]() | B.![]() ![]() |
C.![]() | D.![]() ![]() |
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3 . 设x轴、y轴正方向上的单位向量分别是
、
,坐标平面上点列
分别满足下列两个条件:①
且
;②
且
;
(1)写出
及
的坐标;
(2)求
的坐标;
(3)若△
的面积是
,求
的表达式.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc1480988d26abda64d9a4d20674ab76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89cdb00326a922074494892c166aeefe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6ae2df3cfe81200ae0bf898612c93cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16d37882749aa24648a00cbf1b6ac504.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ba11c64701e24d76699ce3540b0de76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79dcb1c9ae679a2c9d39cbe3aef4026e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acdb889e41dc848490eeea1974a47650.png)
(1)写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7179a1cec8c930d7c6afcaee2c4d908f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/badbf0073031a679eb0caa32f42600ef.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/099448be5ba5b5ed61a197916a6bd8b4.png)
(3)若△
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1358519202b1299715f79cf147e6436a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4560c3ab498f2b5aaef05df664315703.png)
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