名校
解题方法
1 . 在
中,角A,B,C所对的边分别为a,b,c,且
.
(1)求
的值;
(2)若
的面积为
,且
,求
的值
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07afcd6853e9b7364743a67b654aba47.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/721e29b775e696045f44a4b1e7f74ef2.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8af2fdf1944afebb51cb6a5e6c74aadd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e57152f1bd6a622070a8878b7f811731.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20d6fc9b90f370fbb27552876b650f8f.png)
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2020高三·全国·专题练习
名校
解题方法
2 . 已知
,则
的值等于______________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b91ab325335ea68adc135a2d50bfdeb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99c5a05a11f731194a845e68a0479ce4.png)
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解题方法
3 . 在
中,若其面积
,求
的值?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7da5d07b9de54d3ecade760cebfa38aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c32e2f2d7147cf1699fbfdef9cf4af74.png)
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解题方法
4 . 在平面直角坐标系中,设角
的终边上任意一点
的坐标是
,它与原点的距离是
,规定:比值
叫做
的正余混弦,记作
.若
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82a79a33a83a7ba57a34b5093d1d1d02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/447f989d11d8ea5a1ced8dfb6cc1997e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf62a203e40968f6e64a74baf16c5a49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/808c2dc5162f4281753cddf5adfad7f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/956621e324b7e7edc3f34c99379da2b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4e304cf018473bb54edb166fcd6502b.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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10-11高三·江苏·阶段练习
5 . 若
,且
,则
________.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce632c0ad85f24096c0f05d5450e473e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6307a24eb90ab560d720e7369d21135d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b657cfa91b6394e4b00fa385a2c0149.png)
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6 . 在
中,角
、
、
的对边分别为
、
、
,若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/facd1fcfad659e95da18c38e5eb157b8.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdad322dcf9b7f0fa5a5985d482849ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/facd1fcfad659e95da18c38e5eb157b8.png)
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