题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108010331-79496.jpg)
求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108010331-57835.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108010331-75775.png)
答案
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108010331-19867.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108010332-45739.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108010332-73582.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108010332-95125.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108010332-33456.png)
∵PA为⊙O的切线,∴∠PAC=∠PDA,
而∠APC=∠DPA,∴△PAC∽△PDA,
则
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108010333-86707.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108010333-32355.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108010333-33917.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108010333-54260.png)
∵PA=PB,∴
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108010333-86707.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108010333-33917.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108010331-57835.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108010331-75775.png)
核心考点
举一反三
如图,在Rt△ABC中,
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108010325-88969.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108010325-80657.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108010326-37128.png)
(Ⅰ)求证:AC是△BDE的外接圆的切线;
(Ⅱ)若
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108010326-11626.png)
在
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108010317-52736.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108010317-40076.png)
(1)求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108010317-66903.png)
(2)若AC=3,求
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108010317-70021.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108010305-47171.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108010305-32228.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108010305-51014.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108010305-58376.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108010305-65407.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108010305-51014.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108010305-65407.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108010305-47171.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108010305-47157.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108010306-47380.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108010306-80634.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108010306-39865.jpg)
⑴求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108010306-64915.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108010306-35368.png)
⑵求
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108010306-20954.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108010300-52174.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108010301-25841.jpg)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108010256-16904.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108010256-94734.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108010256-16904.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108010256-94734.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108010257-67305.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108010257-99189.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108010257-23295.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108010257-88879.png)
A.![]() | B.![]() |
C.4 | D.3 |
最新试题
- 1函数f(x)的定义域为A,若x1,x2∈A且f(x1)=f(x2)时总有x1=x2,则称f(x)为单函数.例如,函数f(
- 2若ab>0,则一次函数y=ax+b与反比例函数y=在同一坐标系数中的大致图象是( )A.B.C.D.
- 3用斜线(/)给下面短文画横线的部分断句。 昔年过洛见李公简言真宗即东封访天下隐者得杞人杨朴能诗及召对自言不能上问临行有
- 4Electric bicycles which run on battery-operated (电瓶) motors
- 5如图,直三棱柱ABC-A1B1C1中,AB=1,AC=AA1=,∠ABC=60°。 (Ⅰ)证明:AB⊥A1C;(Ⅱ)求二
- 6(2011•雅安)将二次函数y=(x﹣2)2+3的图象向右平移2个单位,再向下平移2个单位,所得二次函数的解析式为 .
- 7仿写句子。以下是《芦花荡》苇塘的景物描写,请仔细体味,仿照其写法,写写你家乡的景物,字数80字左右(3分)“这里的水却是
- 8阅读下面的材料,根据自己的感悟和联想,写一篇不少于800字的文章。(60分)窗子就是一个画框,从窗子望出去,就可以看见一
- 9中国共产党十分注意理论创新,把***理论确立为党的指导思想的会议是A.十一届三中全会B.十三大C.十四大D.十五大
- 10设复数z=2+i(i是虚数单位),则复数z2-1在复平面上对应点的坐标为( )A.(4,4)B.(2,4)C.(-2,
热门考点
- 1按要求写出下列反应的化学方程式并指明反应类型(1)1,3-丁二烯与足量溴水反应_____________________
- 2.下列词语中,加点的字读音都正确的一组是 ( ) A.订(dīng)正数落(lu
- 31946午政治协商会议与1949年中国人民政治协商会议的共同之处在于( )A.召开的地点在北平B.通过宪法性质文件C
- 4阅读理解。 Driving cars, trucks and motorcycles is an importa
- 5忘记远大理想(共产主义理想)只顾眼前,就会失去前进的方向;离开现实工作(共同理想)而空谈远大理想,就会脱离实际。这是因①
- 6细菌一般没有叶绿体,大多数只能依靠吸收现成的有机物生活。[ ]
- 7[三选一选修5:有机化学基础] 盐酸黄连碱对治疗心血管疾病疗效显著。其结构简式如下图F所示。以下是由2,3—二甲氧基
- 8材料一:20世纪80年代以来,人类社会发展面临一系列新问题,如南北差距继续扩大、世界人口剧增、全球生态环境日益恶化等。1
- 9以6和8为两条直角边的直角三角形斜边上中线长为______.
- 101936年12月,张学良说:“大义当前,不容反顾,只求于救亡主张贯彻,有济于国家。”为实现承诺,12月12日,他和杨虎城