题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023031353-24703.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023031353-90939.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023031353-43016.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023031354-39429.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023031354-87373.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023031354-83882.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023031354-75009.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023031354-92157.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023031355-65743.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023031355-86106.png)
(1)若
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023031355-10396.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023031355-66557.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023031355-97483.png)
(2)若
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023031356-65488.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023031356-52990.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023031356-38583.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023031356-20481.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023031357-52373.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023031357-17254.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023031357-52589.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023031357-33911.png)
解析
试题分析:(Ⅰ)解:由
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023031353-24703.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023031353-90939.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023031353-43016.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023031354-39429.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023031357-36850.png)
又
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023031358-82708.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023031358-48792.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023031358-52614.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023031358-28557.png)
设
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023031358-81253.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023031359-72054.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023031359-65653.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023031359-69484.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023031359-65783.png)
代入①,得
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023031400-80357.png)
(Ⅱ)证明:由
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023031356-65488.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023031356-52990.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023031400-60423.png)
∵
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023031357-36850.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023031400-98800.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023031400-19787.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023031357-52589.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023031357-33911.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023031400-47797.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023031356-38583.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023031356-20481.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023031357-52373.png)
点评:本题在圆内接四边形的条件下,一方面证明两条直线平行,另一方面求线段的比值.着重考查了圆中的比例线段、圆内接四边形的性质和相似三角形的判定与性质等知识点,属于中档题.
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023031348-24904.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023031349-52866.png)
A.7或1 | B.![]() | C.![]() | D.7或-1 |
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023031345-93534.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023031345-60954.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023031345-20394.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023031345-93534.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023031345-90687.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023031346-46738.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023031334-50521.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023031334-98541.png)
(Ⅰ)若点
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023031334-62227.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023031335-93097.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023031335-68023.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023031334-62227.png)
(Ⅱ)现有如下真命题:
“过圆
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023031335-51230.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023031335-79097.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023031335-31762.png)
“过圆
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023031335-58960.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023031335-79097.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023031335-23097.png)
据此,写出一般结论,并加以证明.
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023031326-11265.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023031326-59337.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023031326-29997.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023031327-40270.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023031326-11265.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023031322-59696.jpg)
最新试题
- 1用放大镜观察电视机或电脑的屏幕,可发现那五彩缤纷的颜色其实都是由红、______和______色光的三基色组成的.
- 2设数列{an}满足a1=a,an+1=can+1-c,n∈N*,其中a,c为实数,且c≠0。(1)求数列{an}的通项公
- 3如图9 ,在平面直角坐标系中,已知点A (2 ,3 )、B (6 ,3),连结AB,如果点P 在直线y =x -1 上,
- 4Look out! Don’t get too close to the house ________ roof is
- 5书面表达。 7月8日是Tina13岁的生日,她的父母为她举办了一场生日晚会。在晚会上Tina和她的朋友们表演了
- 6听对话,选择正确的答案,对话念两遍。( )1. A. 13 billion.
- 7对于函数,解答下列问题:(1)若定义域为R,求实数a的取值范围;(2)若函数在内为增函数,求实数a的取值范围.
- 8如图,凸透镜不动,一个物体由a逐渐靠近b的过程中,始终可在光屏上得到像,而且不断增大,下列判断正确的是( )A.凸透镜
- 9在△ABC中,AB=AC,AB的垂直平分线与AC所在的直线 相交所得到锐角为50°,则∠B等于_____________
- 10据中央电视台报道,2004年4月下旬,在我国东海海域又发生了数百平方公里的赤潮。赤潮是海洋中一种红色的浮游生物在特定条件
热门考点
- 1表述正确,且符合语体要求的一项是:A 信函:拙著实为不刊之论,感谢贵刊予以付梓。B 广播:此次比赛盛况,本台明晚20点将
- 2由下图可得出的正确结论是[ ]A、阿尔卑斯山脉的形成与板块间的作用无关 B、地中海的面积将来会扩大 C、地中海附
- 3穆罕默德·阿里与凯末尔都试图通过学习西方使国家走向富强。其相同之处主要体现在①进行民主化改革 ②开办新式学校 ③发展工
- 4“始知李太守,伯禹亦不如”,这句话赞美的是[ ]A.李白 B.李耳 C.李斯 D.李冰
- 5阅读下面一段文字,完成(1)~(3)题。(8分)人教版《语文》(八年级上册)为我们打开了一片新天地。在《人民解放写百万大
- 6阅读文段,回答问题。少年哀歌西村寿树(日本) 少年时代,我家住在濑户内海一个无名小岛上,我常常和父亲一起下海捕鱼。
- 7某同学用水平力推静放在水平上的桌子,但未推动,这是因为该同学对桌子的推力[ ]A.大于桌子对该同学的推力B.小于
- 8若集合A={x|x2-x-2<0},B={x|-2<x<a},则“A∩B≠∅”的充要条件是( )A.a>-2B.a≤-
- 9达尔文的_________被恩格斯赞誉为________世纪自然科学的三大发现之一。
- 10 若某程序框图如图所示,则该程序运行后输 出的B等于 ( )A.B