题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030202-98903.png)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030202-15085.png)
(2)若
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030203-27721.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030203-77066.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030203-34619.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030203-91238.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030204-78053.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030204-77916.png)
解析
试题分析:(1)将
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030204-14249.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030204-56911.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030202-98903.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030204-44017.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030203-77066.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030205-58584.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030203-27721.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030205-14007.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030205-75397.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030205-68972.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030206-97464.png)
试题解答:(1)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030206-75631.png)
(2)由题设得:
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030205-58584.png)
即
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030206-86864.png)
若
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030205-68972.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030206-47489.png)
若
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030206-97464.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030206-65993.png)
【考点定位】三角函数的性质、三角恒等变换三角函数的求值.
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030157-34946.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030157-74691.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030157-35296.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030158-13609.jpg)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030152-99321.png)
(1)求角B的大小;
(2)若a+c=1,求b的取值范围
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030143-46878.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030143-87215.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030144-49626.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030144-34582.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030144-34648.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030144-94412.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030145-64869.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030145-75837.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030145-26946.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030145-68033.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030145-16316.png)
(1)求角
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030144-49626.png)
(2)设
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030146-82595.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030146-56950.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030144-34582.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030135-13042.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030135-55053.png)
(1)求角A与角B的大小;
(2)若BC边上的中线AM的长为
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030135-88413.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020030130-71489.png)
A.等边三角形 | B.直角三角形 | C.钝角三角形 | D.锐角三角形 |
最新试题
- 1下列陈述I、II均正确并且有因果关系的是选项陈述I陈述IIAFe3+有氧化性铁盐可用作净水剂BSiO2是两性氧化物SiO
- 2消费价格指数是反映消费品价格变动趋势和程度的相对数,价格越高,价格指数越大。下面表格是英国历史上消费品价格指数变化情况,
- 3 The lady was so absorbed in her job that she didn"t hear a
- 4根据汉语提示完成句子,每空一词。1. 我以前害怕在人群前说话。 I ________ ________ _____
- 5在抗震救灾的现场上,到处活跃着带有“红十字”标记的医护人员。“红十字”成为舍己救人的象征。“红十字”标记与下列哪一宗教有
- 6在下图中,小红与小刚用细棉线连接了两个纸杯,制成了一个 “土电话”。 (1)他们用“土电话”能实现10m间的通话,这表明
- 7(2010北京四中期中)Little Oliver can always his parents,who wi
- 8 现代经济发展与石油的生产、消费息息相关。美国是世界上最大的石油消费国。近两年来,随着石油价格的再次飚升,美国为了
- 9苏联高度集中的社会主义经济政治体制形成的标志是新经济政策实施。[ ]
- 10下列符号中“3”所表示的含义错误的是( )A.3H2O :三个水分子 B.SO3:三氧化硫中含有三个氧原子C
热门考点
- 1假设一只毛色为白色的猫一次生下5只小猫,其中4只是白色小猫,1只是小花猫,请结合所学知识回答下列问题:(1)猫的毛色在遗
- 21857年,美国人约翰逊·沃克从纽约出发到英国伦敦,他乘坐的交通工具应为[ ]A、飞机B、汽车 C、汽船
- 3若函数f(x)=(a-2)x,x≥2(12)x-1,x<2是R上的单调递减函数,则实数a的取值范围是______.
- 4设等差数列{an}的前n项之和为Sn,已知a2=3,a5=9,则S5等于 [ ]A.15 B.20 C.25 D
- 5实验室从碘水中得到纯净的碘的操作,正确的是:A.分液、蒸馏B.过滤、蒸发C.萃取、分液D.萃取、分液、蒸馏
- 6标有指向标的地图,箭头一般指向( )A.正北B.正东C.正西D.正南
- 741届世界博览会,于2010年5月1日至10月31日在上海市举行。某小学计划9月11日全体师生参观世博园。据此回答1—2
- 8阅读下面这则征稿启事,按要求拟写一副对联。(4分)“博古通今,伴我十年书百卷;瞻高眺远,登峰万仞路千条。”“人生百年,会
- 9直线y=kx-4与y轴相交所成的锐角的正切值为12,则k的值为______.
- 10当你从电影院里刚出来的时候,瞳孔的变化是( )A.由大变小B.由小变大C.大小没有明显变化D.无法判断