当前位置:首页>文档>2024年高考数学一轮复习(新高考版)第4章 必刷小题8 解三角形_2.2025数学总复习_2024年新高考资料_1.2024一轮复习_2024年高考数学一轮复习讲义(新高考版)

2024年高考数学一轮复习(新高考版)第4章 必刷小题8 解三角形_2.2025数学总复习_2024年新高考资料_1.2024一轮复习_2024年高考数学一轮复习讲义(新高考版)

  • 2026-03-10 05:09:49 2026-03-10 05:09:49

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2024年高考数学一轮复习(新高考版)第4章 必刷小题8 解三角形_2.2025数学总复习_2024年新高考资料_1.2024一轮复习_2024年高考数学一轮复习讲义(新高考版)
2024年高考数学一轮复习(新高考版)第4章 必刷小题8 解三角形_2.2025数学总复习_2024年新高考资料_1.2024一轮复习_2024年高考数学一轮复习讲义(新高考版)
2024年高考数学一轮复习(新高考版)第4章 必刷小题8 解三角形_2.2025数学总复习_2024年新高考资料_1.2024一轮复习_2024年高考数学一轮复习讲义(新高考版)
2024年高考数学一轮复习(新高考版)第4章 必刷小题8 解三角形_2.2025数学总复习_2024年新高考资料_1.2024一轮复习_2024年高考数学一轮复习讲义(新高考版)
2024年高考数学一轮复习(新高考版)第4章 必刷小题8 解三角形_2.2025数学总复习_2024年新高考资料_1.2024一轮复习_2024年高考数学一轮复习讲义(新高考版)
2024年高考数学一轮复习(新高考版)第4章 必刷小题8 解三角形_2.2025数学总复习_2024年新高考资料_1.2024一轮复习_2024年高考数学一轮复习讲义(新高考版)
2024年高考数学一轮复习(新高考版)第4章 必刷小题8 解三角形_2.2025数学总复习_2024年新高考资料_1.2024一轮复习_2024年高考数学一轮复习讲义(新高考版)

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必刷小题 8 解三角形 一、单项选择题 1.(2023·重庆模拟)在△ABC中,sin A=,AC=,B=45°,则BC等于( ) A.2 B. C.2 D.2 答案 D 解析 由正弦定理知,=, ∴BC===2. 2.(2023·南昌模拟)△ABC的内角A,B,C所对的边分别为a,b,c,若b=3,c=2, △ABC的面积为2sin B,则cos A等于( ) A. B. C. D. 答案 D 解析 因为b=3,c=2,△ABC的面积为2sin B,所以S =acsin B=2sin B, △ABC 所以a=2,由余弦定理得cos A==. 3.在△ABC中,角A,B,C所对的边分别是a,b,c,若asin A+b(sin B+sin A)=csin C,则C等于( ) A.30° B.60° C.120° D.150° 答案 D 解析 因为asin A+b(sin B+sin A)=csin C, 所以由正弦定理得a2+b(b+a)=c2, 化简得a2+b2-c2=-ab, 所以由余弦定理得cos C===-, 因为C∈(0,π), 所以C=150°. 4.(2023·郑州模拟)2021年11月,郑州二七罢工纪念塔入选全国职工爱国主义教育基地名 单.某数学建模小组为测量塔的高度,获得了以下数据:甲同学在二七广场 A地测得纪念 塔顶D的仰角为45°,乙同学在二七广场B地测得纪念塔顶D的仰角为30°,塔底为C(A, B,C在同一水平面上,DC⊥平面ABC),测得AB=63 m,∠ACB=30°,则纪念塔的高CD 为( ) A.40 m B.63 m C.40m D.63m 答案 B 解析 如图所示,∠DAC=45°,∠CBD=30°,∠ACB=30°,设塔高CD为t,因为DC⊥平 面ABC,所以DC⊥CA,DC⊥CB,所以AC=t,BC=t,又AB2=AC2+BC2-2AC·BC·cos∠ACB, 即632=t2+3t2-2×t×t×, 解得t=63 m. 5.(2022·南宁模拟)在△ABC中,角A,B,C所对的边分别为a,b,c,a=2,b2+c2=a2+ bc,则△ABC外接圆的面积是( ) A. B. C.2π D.4π 答案 B 解析 因为b2+c2=a2+bc,所以b2+c2-a2=bc, 由余弦定理得cos A==, 所以sin A=, 设△ABC外接圆的半径为R,由正弦定理得2R==, 所以R=, 所以△ABC外接圆的面积是πR2=. 6.设△ABC的内角A,B,C的对边分别是a,b,c,tan A=,且B为钝角.则sin A+sin C的取值范围是( ) A. B. C. D. 答案 A 解析 由tan A=以及正弦定理得==,所以sin B=cos A,即sin B=sin, 又B为钝角,所以+A∈, 故B=+A, C=π-(A+B)=-2A>0⇒A∈, 于是sin A+sin C=sin A+sin=sin A+cos 2A=-2sin2A+sin A+1=-22+, 因为A∈,所以00,设g(x)=9x2-40m2x+16m4+,则方程g(x)=0在(0,+∞)上有解,所以g=92- 40m2×+16m4+≤0,解得m4≥,即m≥. 二、多项选择题 9.(2022·福州模拟)下列对△ABC解的个数的判断中正确的是( ) A.a=7,b=14,A=30°,有一解 B.a=30,b=25,A=150°,有一解 C.a=,b=,A=60°,有一解 D.a=6,b=9,A=45°,有两解 答案 AB 解析 选项A,bsin A=14sin 30°=7=a,则三角形有一解,判断正确; 选项B,bsin A=25sin 150°=,则a>b>bsin A,则三角形有一解,判断正确; 选项C,bsin A=sin 60°=,则a
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  1. CONNECT:[ UseTime:0.000719s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000671s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000311s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000254s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000471s ]
  6. SELECT * FROM `set` [ RunTime:0.000194s ]
  7. SHOW FULL COLUMNS FROM `wendang` [ RunTime:0.000522s ]
  8. SELECT * FROM `wendang` WHERE `id` = 369773 LIMIT 1 [ RunTime:0.001870s ]
  9. UPDATE `wendang` SET `liulancishu` = 1 WHERE `id` = 369773 [ RunTime:0.009161s ]
  10. UPDATE `wendang` SET `lasttime` = 1773090605 WHERE `id` = 369773 [ RunTime:0.000537s ]
  11. SELECT * FROM `wendang` WHERE `id` < 369773 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000489s ]
  12. SELECT * FROM `wendang` WHERE `id` > 369773 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.003590s ]
  13. SELECT * FROM `wendang` WHERE `id` <> 369773 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.004992s ]
  14. SELECT * FROM `wendang` WHERE `id` <> 369773 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000904s ]
  15. SELECT * FROM `wendang` WHERE `id` <> 369773 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002036s ]
0.176484s