Forgot password
 Register account
View 1882|Reply 5

[几何] 直线与圆

[Copy link]

167

Threads

381

Posts

5

Reputation

Show all posts

lrh2006 posted 2020-3-25 18:19 |Read mode
QQ图片20200325181516.png
QQ图片20200325181540.png
请教各位,谢谢啦

673

Threads

110K

Posts

218

Reputation

Show all posts

kuing posted 2020-3-25 18:32
因为E到AO的距离大于E到AF的距离,所以AB大于AC

167

Threads

381

Posts

5

Reputation

Show all posts

original poster lrh2006 posted 2020-3-25 21:00
Last edited by lrh2006 2020-3-25 21:38回复 2# kuing


    kk,你别骂我,我还没听懂。。。能不能讲详细点嘛,为什么点到线的距离大于,就能得到AB>AC?

167

Threads

381

Posts

5

Reputation

Show all posts

original poster lrh2006 posted 2020-3-25 22:09
我想证明∠AEB大于∠AEC,然后在△AEB和△AEC中,就能知道AB>AC,虽然图形中能看出弧BH大于弧CH,但是我给不出证明

673

Threads

110K

Posts

218

Reputation

Show all posts

kuing posted 2020-3-26 00:50
回复 4# lrh2006

TIM截图20200324205156.png
如上图,由割线定理 AB*(AB+BD)=AC*(AC+CE)
于是 AB>AC <=> BD<CE <=> O到AD距离 > O到AE距离

167

Threads

381

Posts

5

Reputation

Show all posts

original poster lrh2006 posted 2020-3-26 01:09
回复 5# kuing


    这都能想到的,kk你到底是什么做的?我还是继续叫你k神吧。。。那我的想法能继续吗?好像是广东哪一年的高考题吧,化到最后就是这个问题了,参考答案直接给出结果,我觉得不容易看出来啊,当然,图画得准是能看出来的,问题是手画没有那么准啊

Quick Reply

Advanced Mode
B Color Image Link Quote Code Smilies
You have to log in before you can reply Login | Register account

$\LaTeX$ formula tutorial

Mobile version

2025-7-15 13:56 GMT+8

Powered by Discuz!

Processed in 0.013335 seconds, 26 queries