截距式是直線或平面的一種表示形式,是指用直線或平面在坐標軸上的截距來寫出的直線或平面的表達式。其中直線的截距式為x/a+y/b=1(a≠0且b≠0)。其中a指橫截距,b指縱截距。即與x軸交點是A(a,0),與y軸交點是B(0,b) 。平面的截距式為x/a+y/b+z/c=1(a≠0,b≠0且c≠0)。即與x軸交點是P(a,0,0),與y軸交點是Q(0,b,0) ,與z軸交點是R(0,0,c) 。
基本介紹
- 中文名:截距式
- 外文名:Intercept formula
定義
![](/img/d/00c/833e78f93d978886ffaa6aad252d.jpg)
![](/img/4/d04/61145319ee6f5a0198a939fc4d4b.jpg)
截距式的推導
直線的截距式
![](/img/8/a06/2379b7d2f5d1c7d789c2a5c20da5.jpg)
![](/img/f/a3c/e17692cf5edd4041bb9bcba5761c.jpg)
![](/img/5/037/78d4e1e0715903cdf2f0be950f21.jpg)
![](/img/b/c3e/d39b887486bcc2f6052080e1432b.jpg)
![](/img/d/17e/e6c46e9f7ea8aa9018130c867f35.jpg)
![](/img/c/3b1/87a31d97d9fa73e119b916a53565.jpg)
![](/img/e/c0b/98f66787f32e1cb666fc237ae559.jpg)
![](/img/7/f68/0b3d5bac97f744ba47b9cdba61eb.jpg)
![](/img/0/e85/b660c643d10aa326d4972cecdb3a.jpg)
![](/img/9/018/173b62a977ad36f79ee743899eed.jpg)
![](/img/a/b24/12cd11e08140a4db178d19eec015.jpg)
![](/img/3/a5f/3dc51d42fcc933b3377689502b57.jpg)
![](/img/d/00c/833e78f93d978886ffaa6aad252d.jpg)
平面的截距式
![](/img/6/8c3/117572bc02712d183b068aa426e3.jpg)
![](/img/6/a90/004af8ba4ff8107fd81258bb8c39.jpg)
![](/img/d/2b8/d79759730bc2431bb06ee7aa0185.jpg)
![](/img/f/b74/2e136de1e6e9f7c27aa548a3c974.jpg)
![](/img/4/129/eadfca6054c1c513a9a8e4da8b17.jpg)
![](/img/0/cbc/f242d3dbcd64d8f7b0765c10abc7.jpg)
![](/img/e/a3d/88adb1ad3ee3209f005c8c2f7fc0.jpg)
![](/img/8/68e/33c3c6f4b68ab8943cca5b5b73c1.jpg)
![](/img/4/38f/88ee7b6d6cc406b69f9556622158.jpg)
![](/img/1/a3c/5ffa932bea270deeaae1918e52cf.jpg)
![](/img/f/634/5dd79975e314c1d9030301e21e0a.jpg)
![](/img/7/8c6/c113acb7ac69ab2c2333659eb5ca.jpg)
![](/img/8/287/657ad6b42012d4205df704ce85e6.jpg)
![](/img/b/ab9/08663ca234a6fdca6d09102bf623.jpg)
![](/img/4/d04/61145319ee6f5a0198a939fc4d4b.jpg)