题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104123023-79469.png)
答案
解析
解:原式=
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104123023-33403.png)
答案:1
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104123015-35192.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104123015-16498.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104123015-14777.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104123015-11978.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104123015-68795.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104123015-94900.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104123016-68368.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104123016-35207.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104123016-63635.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104123016-20558.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104123016-43886.jpg)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104123008-33869.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104123009-66343.png)
小题1:(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104123010-18527.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104123010-35626.png)
即:
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104123001-21254.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104123001-97185.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104123001-22093.png)
在Rt
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104123001-62582.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104123002-53729.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104123002-70098.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104123002-62235.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104123001-21254.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104123001-97185.png)
即 三角形的面积等于两边之长与夹角正弦之积的一半.
如图(2),在
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104123003-50836.png)
∵
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104123003-64102.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104123001-97185.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104123001-97185.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104123001-97185.png)
即 AC·BC·sin(α+β)= AC·CD·sinα+BC·CD·sinβ
请你利用直角三角形边角关系,消去②中的AC、BC、CD,只用
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104123003-46599.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104123003-96526.png)
小题1:(1)______________________________________________________________
小题2:(2)利用这个结果计算:
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104123004-22387.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104122954-46683.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104122955-71826.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104122955-34489.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104122955-74698.png)
小题1:(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104122954-46683.png)
小题2:(2) 若
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104122955-71940.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104122948-65846.png)
最新试题
- 1【题文】(10分)阅读下列材料,结合所学知识回答问题材料一 早在殷商之时,中国就有了禁
- 2下图是一幅军事部署简图,读图回答下列各题。小题1:我军阵地与敌军阵地的图上距离约为3厘米,则两地的实际距离约是(
- 3在田径比赛中,裁判测量跳远成绩的依据是______;测量推铅球成绩的依据是______.
- 4计算:(18-2)×2a=______.
- 5二战后,资本主义各国纷纷调整经济政策,形成不同的发展模式,推动本国经济发展。相关认识不正确的有A.加强国家干预是这些国家
- 6“红色荒漠”形成的人为原因主要是( )A.滥伐森林B.过度放牧C.开山取石D.环境污染
- 7已知在(3x-123x)n的展开式中,第6项为常数项.(1)求n; (2)求含x2项的系数; (3)求展开式中所有的有理
- 8国家卫生和计划生育委员会发布H7N9禽流感诊断标准:据流感的潜伏期及现有H7N9禽流感病例的调查,潜伏期一般为7天以内.
- 9生物体具有一定的结构层次.下列哪一组结构能够不断产生新细胞( )①菠菜中肉 ②桃树的芽 ③玉米根尖分生区 ④人的
- 10解方程组:
热门考点
- 1文艺复兴首先出现在意大利的根本原因是 [ ]A.古代希腊罗马的文化遗存 B.意大利思想家们的努力 B.资本
- 2The number of students admitted annually to this school
- 3将下列宗教与其经典连线:A基督教 a《古兰经》B伊斯兰b《圣经》C佛教c《金刚经》
- 4自行车的轮胎上印有花纹,这是为了 ______,自行车的轮轴上装了轴承,这是为了 ______、钢丝钳的钳口上刻有花纹,
- 5选出下面各项中字音有误的一项:A沮丧jǔ请假jià校对jiào 装载zài 恶ě心B句读dòu 请帖tiě帐簿bù澄清c
- 6小敏想知道校园内一棵大树的高(如图),他测得CB=10米,∠ACB=60°,请你帮他算出树高AB约为
- 7 Not long ago, people thought babies were not able to learn
- 8It"s wise of you to________your father"s advice when you com
- 9下列对蝗虫外骨骼功能的叙述,不正确的是( )A.保护内部柔软的器官B.保护体内的骨骼C.支持体内器官D.防止体内的水分
- 10在扇形统计图中,若将圆均匀等分成12等份,则每一份的扇形圆心角为[ ]A.30°B.45°C.60°D.90°