当前位置:首页>免费下载>【免费下载】25-26学年同步培优讲义培优课 解三角形中的综合问题(学生版课时跟踪检测

【免费下载】25-26学年同步培优讲义培优课 解三角形中的综合问题(学生版课时跟踪检测

  • 2026-01-11 21:49:18
【免费下载】25-26学年同步培优讲义培优课 解三角形中的综合问题(学生版课时跟踪检测

培优课解三角形中的综合问题

1.已知a,b,c分别是ABC的内角A,B,C的对边,若ABC的周长为41),且sin Bsin Csin A,则a=(

A.B.2

C.4D.2

2.(2024·威海质检ABC中,角A,B,C的对边分别为a,b,c,已知三个向量ma,cos),nb,cos),pc,cos共线,则ABC

A.等边三角形B.钝角三角形

C.直角三角形D.等腰直角三角形

3.ABC中,角A,B,C的对边分别为a,b,c,已知ABC的面积为120°,c2bcos B,则AC边上的中线长为

A.B.3C.D.4

4.已知ABC的内角A,B,C的对边分别为a,b,c,A60°,b3c,角A的平分线交BC于点D,且BDADB=(

A.-B.C.D

5.(2024·郑州月考ABC中,角A,B,C的对边分别为a,b,c,且BC边上的高为a,则的最大值为

A.8B.6C.3D.4

6.ABC中,角A,B,C所对的边分别为a,b,c,∠BACBC上一点,且BD3DC,AD3,则ABC面积的最大值是

A.3B.4C.5D.6

7.(多选在RtABC中,C90°,A的平分线交BC于点D,AD1,cosBAC

A.AB8B.

C.AB6D.ABD的面积为

8.(多选ABC中,内角A,B,C所对的边分别为a,b,c,且ab)∶(ac)∶(bc)=91011,则下列结论正确的是

A.sin Asin Bsin C456

B.ABC是钝角三角形

C.ABC的最大内角是最小内角的2倍

D.c6,则ABC外接圆的半径为

9.(2024·金华月考ABC中,内角A,B,C所对的边分别为a,b,c,若2sin Asin Bcos Csin2C,则    ,角C的最大值为.

10.已知ABC的内角A,B,C的对边分别为a,b,c.C6,1b4,则sin A的取值范围为.

11.已知a=(sin x,-cos x),b=(cos x,cos x),fx)=a·b.

1求函数fx图象的对称轴方程

2ABC的内角A,B,C所对的边分别为a,b,c,若fB)=b.ac的取值范围.

12.(2024·潮州月考ABC中,DBC上的点,AD平分BAC,△ABD的面积是ADC面积的2倍.

1

2AD1,DCBDAC的长.

13.如图,某镇有一块空地形如OAB,其中OA3 km,OB3 km,∠AOB90°.当地镇政府规划将这块空地改造成一个旅游景点,拟在中间挖一个人工湖OMN,其中M,N都在边AB上,且MON30°,挖出的泥土堆放在OAM地带上形成假山,剩下的OBN地带开设儿童游乐场.为安全起见,需在OAN的一周安装防护网.

1AM km时,求防护网的总长度

2为了节省投入的资金,人工湖OMN的面积要尽可能小.如何设计施工方案,可使OMN的面积最小,最小面积是多少

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  134. /yingpanguazai/ssd/ssd1/www/yeyulingfeng.com/vendor/topthink/think-view/src/Think.php ( 8.38 KB )
  135. /yingpanguazai/ssd/ssd1/www/yeyulingfeng.com/vendor/topthink/framework/src/think/contract/TemplateHandlerInterface.php ( 1.60 KB )
  136. /yingpanguazai/ssd/ssd1/www/yeyulingfeng.com/vendor/topthink/think-template/src/Template.php ( 46.61 KB )
  137. /yingpanguazai/ssd/ssd1/www/yeyulingfeng.com/vendor/topthink/think-template/src/template/driver/File.php ( 2.41 KB )
  138. /yingpanguazai/ssd/ssd1/www/yeyulingfeng.com/vendor/topthink/think-template/src/template/contract/DriverInterface.php ( 0.86 KB )
  139. /yingpanguazai/ssd/ssd1/www/yeyulingfeng.com/runtime/temp/8ef20ebb20ac8b82ec5232b0bcb62051.php ( 11.99 KB )
  140. /yingpanguazai/ssd/ssd1/www/yeyulingfeng.com/vendor/topthink/think-trace/src/Html.php ( 4.42 KB )
  1. CONNECT:[ UseTime:0.000808s ] mysql:host=127.0.0.1;port=3306;dbname=no_yeyulingfeng;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000992s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000320s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000402s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000872s ]
  6. SELECT * FROM `set` [ RunTime:0.000225s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000598s ]
  8. SELECT * FROM `article` WHERE `id` = 460496 LIMIT 1 [ RunTime:0.000495s ]
  9. UPDATE `article` SET `lasttime` = 1768162468 WHERE `id` = 460496 [ RunTime:0.010988s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000405s ]
  11. SELECT * FROM `article` WHERE `id` < 460496 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000649s ]
  12. SELECT * FROM `article` WHERE `id` > 460496 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.004524s ]
  13. SELECT * FROM `article` WHERE `id` < 460496 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000718s ]
  14. SELECT * FROM `article` WHERE `id` < 460496 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000773s ]
  15. SELECT * FROM `article` WHERE `id` < 460496 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.015653s ]
0.123992s