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2021年正弦与余弦定理练习题及答案.pdf

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1、正弦定理练习题1在ABC中，A45，B60，a2，则b等于()D262在ABC中，已知a8，B60，C75，则b等于()A42 B43 C4 6 3在ABC中，角A、B、C的对边分别为a、b、c，A60，a4 3，b42，则角B为()A45或 135 B 135 C45 D以上答案都不对4在ABC中，abc156，则sinAsinBsinC等于()A156B651 C615 D不确定5在ABC中，a，b，c分别是角A，B，C所对的边，若A105，B45，b2，则c()A1 C2 6在ABC中，若cos Acos Bba，则ABC是()A 等腰三角形B 等边三角形C 直角三角

2、形D等腰三角形或直角三角形7已知ABC中，AB3，AC1，B30，则ABC的面积精品w o r d 学习资料可编辑资料-精心整理-欢迎下载-第 1 页，共 14 页为()或3 或328ABC的内角A、B、C的对边分别为a、b、c.若c2，b6，B120，则a等于()B2 9在ABC中，角A、B、C所对的边分别为a、b、c，若a1，c3，C3，则A_.10 在ABC中，已知a4 33，b4，A30，则 sinB_.11在ABC中，已知A30，B120，b12，则ac_.12在ABC中，a2bcosC，则ABC的形状为 _13在ABC中，A60，a63，b12，SABC183，则abcsinA

3、sinBsinC_，c_.14在ABC中，已知a32，cosC13，SABC43，则b_.15在ABC中，a、b、c分别为角A、B、C的对边，若a23，sinC2cosC214，sin Bsin Ccos2A2，求A、B及b、c.精品w o r d 学习资料可编辑资料-精心整理-欢迎下载-第 2 页，共 14 页文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9

4、 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C

5、2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F

6、5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A

7、7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10

8、C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码

9、:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9

10、I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C916ABC中，ab603，sin Bsin C，ABC的面积为 15 3，求边b的长余弦定理练习题1在ABC中，如果BC6，AB4，cosB13，那么AC等于()A 6 B 26 C 36 D 462在ABC中，a2，b31，C30，则c等于()D23在ABC中，a2b2c23bc，则A等于()A 60 B45C 120 D1504在ABC中，A、B、C的对边分别为a、b、c，若(a2c2b2)tanB3ac，则B的值为()或56或235在ABC中

11、，a、b、c分别是A、B、C的对边，则acosBbcosA等于()Aa Bb Cc D以上均不对6 已知锐角三角形ABC中，|AB|4，|AC|1，ABC的面积为3，则ABAC的值为()精品w o r d 学习资料可编辑资料-精心整理-欢迎下载-第 3 页，共 14 页文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E

12、10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档

13、编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9

14、A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7

15、W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL1

16、0C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P

17、1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR

18、6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9A2 B2 C4 D47在ABC中，b3，c3，B30，则a为()B23 或 23 D28已知ABC的三个内角满足 2BAC，且AB1，BC4，则边BC上的中线AD的长为 _9已知a、b、c是ABC的三边，S是ABC的面积，若a4，b5，S5 3，则边c的值为_10在ABC中，sin Asin Bsin C234，则 cos Acos Bcos C_.11在ABC中，a32，cos C13，SABC43，则b_.12已知ABC的三边长分别是a、b、c，且面积Sa2b2c24，则角C_.13在

19、ABC中，BCa，ACb，a，b是方程x223x20 的两根，且 2cos(AB)1，求AB的长精品w o r d 学习资料可编辑资料-精心整理-欢迎下载-第 4 页，共 14 页文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C

20、9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:

21、CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I

22、1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9

23、HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2

24、J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5

25、 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7

26、D9E10C914在ABC中，BC5，AC3，sin C2sin A.(1)求AB的值；(2)求 sin(2A4)的值正弦定理1在ABC中，A45，B60，a2，则b等于()D26解析：选A.应用正弦定理得：asinAbsinB，求得basinBsinA6.2在ABC中，已知a8，B60，C75，则b等于()A42 B43 C46 解析：选 45，由正弦定理得basinBsinA46.3在ABC中，角A、B、C的对边分别为a、b、c，A60，a43，b42，则角B为()A45或 135 B135 C45 D以上答案都不对解析：选 C.由正弦定理asinAbsinB得：sinBbsinAa22，

27、又ab，B60，B45.4在ABC中，abc156，则sinAsinBsinC等于()A156B651C615 D不确定解析：选A.由正弦定理知sinAsinBsinCabc156.5在ABC中，a，b，c分别是角A，B，C所对的边，若A105，B45，b2，精品w o r d 学习资料可编辑资料-精心整理-欢迎下载-第 5 页，共 14 页文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文

28、档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL

29、9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A

30、7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL

31、10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4

32、P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 Z

33、R6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9

34、E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9则c()A1 C2 解析：选 1801054530，由bsinBcsinC得c2sin 30 sin45 1.6在ABC中，若cos Acos Bba，则ABC是()A等腰三角形 B 等边三角形 C 直角三角形 D 等腰三角形或直角三角形解析：选D.basin Bsin A，cos Acos Bsin Bsin A，sinAcosAsinBcosB，sin2Asin2B即 2A 2B或 2A2B，即AB，或AB2.7已

35、知ABC中，AB3，AC1，B30，则ABC的面积为()或3 或32解析：选ACsinB，求出 sinC32，ABAC，C有两解，即C60或 120，A90或 30.再由S ABC12ABACsinA可求面积8ABC的内角A、B、C的对边分别为a、b、c.若c2，b6，B120，则a等于()B2解析：选D.由正弦定理得6sin120 2sinC，sinC12.又C为锐角，则C30，A30，精品w o r d 学习资料可编辑资料-精心整理-欢迎下载-第 6 页，共 14 页文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL

36、10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4

37、P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 Z

38、R6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9

39、E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文

40、档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL

41、9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A

42、7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9ABC为等腰三角形，ac2.9在ABC中，角A、B、C所对的边分别为a、b、c，若a1，c3，C3，则A_.解析：由正弦定理得：asinAcsinC，所以 sinAasinCc12.又ac，AC3，A6.答案：610在ABC中，已知a433，b4，A30，则sinB _.解析：由正弦定理得

43、asinAbsinB?sinBbsinAa41243332.答案：3211在ABC中，已知A30，B120，b12，则ac_.解析：C1801203030，ac，由asinAbsinB得，a12sin30 sin120 43，ac 83.答案：8312在ABC中，a2bcosC，则ABC的形状为 _解析：由正弦定理，得a2RsinA，b2RsinB，代入式子a 2bcosC，得精品w o r d 学习资料可编辑资料-精心整理-欢迎下载-第 7 页，共 14 页文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4

44、P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 Z

45、R6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9

46、E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文

47、档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL

48、9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A

49、7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL

50、10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C9文档编码:CL9A9I1A7W9 HL10C2J4P1F5 ZR6A7D9E10C92RsinA22RsinBcosC，所以 sinA2sinBc osC，即 sinBcosCcosBsinC2sinBcosC，化简，整理，得sin(BC)0.0B180，0C180，180BC180，BC0，BC.答案：等腰三角形13 在ABC中，A60，a63，b12，SABC183，则abcsi

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