11:49:00 -
16:36:00 -
19:02:00 -
00:28:00 -
00:42:00 -
00:50:00 -
03:21:00 -
04:07:00 -
04:31:00 -
06:02:00 -
06:18:00 -
07:17:00 -
07:31:00 -
08:20:00 -
08:39:00 -
10:32:00 -
13:12:00 -
16:10:00 -
16:52:00 -
17:09:00 -
17:22:00 -
18:33:00 -
19:31:00 -
20:31:00 -
23:02:00 -
23:13:00 -
02:17:00 -
02:26:00 -
07:06:00 -
07:40:00 -
08:10:00 -
12:16:00 -
12:23:00 -
17:08:00 -
17:58:00 -
18:36:00 -
20:03:00 -
22:24:00 -
22:34:00 -
07:12:00 -
11:25:00 -
12:08:00 -
12:28:00 -
15:29:00 -
23:28:00 -
00:15:00 -
02:06:00 -
02:30:00 -
03:06:00 -
04:35:00 -
06:27:00 -
10:39:00 -
12:58:00 -
14:07:00 -
15:38:00 -
15:41:00 -
16:13:00 -
16:23:00 -
16:34:00 -
19:08:00 -
22:37:00 -
02:02:00 -
03:33:00 -
03:48:00 -
04:14:00 -
12:06:00 -
13:09:00 -
13:42:00 -
13:54:00 -
17:42:00 -
23:01:00 -
00:15:00 -
01:23:00 -
01:41:00 -
01:55:00 -
01:58:00 -
03:43:00 -
04:18:00 -
05:30:00 -
06:01:00 -
07:51:00 -
07:54:00 -
08:43:00 -
10:05:00 -
10:15:00 -
13:31:00 -
13:53:00 -
14:13:00 -
14:49:00 -
15:16:00 -
16:44:00 -
17:33:00 -
18:24:00 -
18:34:00 -
19:02:00 -
19:03:00 -
19:13:00 -
21:19:00 -
21:43:00 -
21:53:00 -
22:40:00 -
23:14:00 -
03:01:00 -
07:46:00 -
10:03:00 -
11:49:00 -
23:36:00 -
07:50:00 -
08:40:00 -
09:18:00 -
10:21:00 -
10:40:00 -
11:25:00 -
11:53:00 -
12:28:00 -
13:17:00 -
16:04:00 -
19:40:00 -
00:11:00 -
00:26:00 -
00:33:00 -
01:11:00 -
03:19:00 -
03:39:00 -
03:59:00 -
04:17:00 -
05:06:00 -
08:29:00 -
08:31:00 -
09:04:00 -
10:31:00 -
11:34:00 -
12:49:00 -
13:20:00 -
14:43:00 -
15:04:00 -
17:32:00 -
18:03:00 -
22:31:00 -
03:16:00 -
03:22:00 -
06:25:00 -
06:34:00 -
07:18:00 -
07:44:00 -
11:12:00 -
12:32:00 -
13:06:00 -
14:50:00 -
15:50:00 -
16:28:00 -
20:04:00 -
23:49:00 -
00:31:00 -
01:37:00 -
03:42:00 -
05:13:00 -
05:17:00 -
05:40:00 -
06:13:00 -
06:17:00 -
06:30:00 -
07:16:00 -
07:22:00 -
09:00:00 -
09:08:00 -
10:21:00 -
11:22:00 -
11:41:00 -
11:58:00 -
13:05:00 -
13:55:00 -
13:59:00 -
14:02:00 -
14:52:00 -
19:25:00 -
19:51:00 -
20:10:00 -
20:27:00 -
20:48:00 -
21:07:00 -
22:06:00 -
22:34:00 -
23:25:00 -
00:24:00 -
00:27:00 -
04:30:00 -
06:06:00 -
07:24:00 -
13:23:00 -
14:19:00 -
15:05:00 -
18:51:00 -
20:23:00 -
00:42:00 -
00:51:00 -
03:30:00 -
08:31:00 -
11:18:00 -
11:43:00 -
14:07:00 -
15:09:00 -
17:05:00 -
17:06:00 -
18:55:00 -
20:02:00 -
02:18:00 -
11:43:00 -
12:46:00 -
17:08:00 -
17:34:00 -
17:58:00 -
19:54:00 -
20:30:00 -
02:57:00 -
12:56:00 -
14:39:00 -
15:05:00 -
18:46:00 -
22:19:00 -
22:36:00 -
00:11:00 -
00:34:00 -
01:04:00 -
02:40:00 -
02:57:00 -
04:38:00 -
06:10:00 -
06:14:00 -
06:23:00 -
06:54:00 -
07:13:00 -
07:28:00 -
07:47:00 -
08:18:00 -
11:51:00 -
12:04:00 -
14:42:00 -
17:04:00 -
17:27:00 -
18:40:00 -
18:49:00 -
20:00:00 -
20:58:00 -
21:07:00 -
21:47:00 -
22:33:00 -
23:08:00 -
01:06:00 -
02:14:00 -
03:07:00 -
06:25:00 -
08:03:00 -
12:27:00 -
13:01:00 -
14:27:00 -
19:31:00 -
21:07:00 -
22:13:00 -
23:19:00 -
23:32:00 -
23:47:00 -
04:17:00 -
08:46:00 -
09:27:00 -
20:35:00 -
20:37:00 -
23:24:00 -
01:56:00 -
07:44:00 -
14:03:00 -
00:10:00 -
01:51:00 -
03:55:00 -
05:43:00 -
06:05:00 -
07:23:00 -
08:37:00 -
08:42:00 -
10:05:00 -
11:21:00 -
13:00:00 -
13:58:00 -
14:26:00 -
18:11:00 -
20:39:00 -
21:59:00 -
22:44:00 -
23:07:00 -
23:34:00 -
23:37:00 -
02:02:00 -
03:56:00 -
08:39:00 -
09:53:00 -
10:29:00 -
10:36:00 -
15:05:00 -
16:01:00 -
16:22:00 -
17:16:00 -
21:43:00 -
22:36:00 -
23:00:00 -
20:45:00 -
00:46:00 -
01:42:00 -
03:28:00 -
05:34:00 -
05:37:00 -
09:08:00 -
13:37:00 -
14:01:00 -
14:13:00 -
18:18:00 -
19:24:00 -
19:25:00 -
21:36:00 -
21:44:00 -
22:24:00 -
23:17:00 -
02:49:00 -
03:20:00 -
04:37:00 -
05:43:00 -
06:25:00 -
12:17:00 -
16:15:00 -
16:59:00 -
18:21:00 -
20:47:00 -
21:54:00 -
23:05:00 -
07:39:00 -
11:05:00 -
11:42:00 -
12:41:00 -
12:45:00 -
13:36:00 -
13:37:00 -
18:19:00 -
19:10:00 -
19:49:00 -
20:11:00 -
20:55:00 -
00:27:00 -
00:29:00 -
02:02:00 -
02:23:00 -
03:53:00 -
04:04:00 -
04:10:00 -
04:36:00 -
04:47:00 -
04:55:00 -
05:16:00 -
05:20:00 -
05:49:00 -
08:03:00 -
09:24:00 -
09:25:00 -
09:39:00 -
09:46:00 -
10:05:00 -
12:28:00 -
13:48:00 -
15:04:00 -
15:45:00 -
17:15:00 -
18:05:00 -
18:08:00 -
19:17:00 -
19:18:00 -
20:47:00 -
20:52:00 -
20:55:00 -
23:23:00 -
23:36:00 -
05:15:00 -
05:38:00 -
09:08:00 -
10:01:00 -
12:47:00 -
13:40:00 -
17:08:00 -
17:46:00 -
20:21:00 -
21:26:00 -
21:59:00 -
00:30:00 -
00:54:00 -
01:11:00 -
02:15:00 -
05:33:00 -
09:12:00 -
10:51:00 -
15:16:00 -
16:55:00 -
01:31:00 -
05:08:00 -
06:05:00 -
06:14:00 -
11:22:00 -
11:45:00 -
13:03:00 -
14:15:00 -
17:22:00 -
18:51:00 -
20:51:00 -
20:54:00 -
00:30:00 -
01:14:00 -
03:45:00 -
05:33:00 -
07:21:00 -
10:27:00 -
14:14:00 -
15:20:00 -
17:04:00 -
19:33:00 -
20:16:00 -
22:01:00 -
23:23:00 -
04:30:00 -
10:22:00 -
13:01:00 -
23:27:00 -
00:21:00 -
00:36:00 -
01:04:00 -
01:44:00 -
02:37:00 -
04:09:00 -
04:21:00 -
06:12:00 -
06:36:00 -
07:10:00 -
07:17:00 -
07:50:00 -
08:34:00 -
08:42:00 -
08:52:00 -
09:17:00 -
11:59:00 -
12:28:00 -
12:54:00 -
13:07:00 -
13:52:00 -
14:12:00 -
14:37:00 -
14:50:00 -
16:08:00 -
16:57:00 -
19:41:00 -
21:21:00 -
21:46:00 -
23:34:00 -
01:25:00 -
01:30:00 -
02:02:00 -
02:38:00 -
04:15:00 -
05:49:00 -
08:48:00 -
09:40:00 -
09:59:00 -
10:00:00 -
10:43:00 -
11:38:00 -
13:00:00 -
16:13:00 -
16:30:00 -
16:48:00 -
17:26:00 -
18:45:00 -
19:46:00 -
23:37:00 -
00:35:00 -
01:56:00 -
02:43:00 -
04:42:00 -
05:19:00 -
09:00:00 -
15:07:00 -
15:46:00 -
18:38:00 -
00:58:00 -
05:43:00 -
05:56:00 -
07:03:00 -
09:08:00 -
15:12:00 -
17:16:00 -
17:40:00 -
18:03:00 -
18:42:00 -
20:05:00 -
22:11:00 -
22:28:00 -
00:15:00 -
02:25:00 -
02:29:00 -
03:59:00 -
04:52:00 -
04:57:00 -
05:00:00 -
05:20:00 -
06:18:00 -
07:52:00 -
08:01:00 -
08:21:00 -
08:33:00 -
09:49:00 -
09:53:00 -
09:56:00 -
12:03:00 -
13:03:00 -
14:55:00 -
18:02:00 -
18:33:00 -
18:58:00 -
19:12:00 -
19:36:00 -
23:13:00 -
23:21:00 -
00:25:00 -
00:45:00 -
01:43:00 -
01:52:00 -
02:16:00 -
03:10:00 -
05:29:00 -
07:49:00 -
11:49:00 -
15:38:00 -
19:08:00 -
19:56:00 -
访问统计：已知正方形ABCD，点E在CD上，且CE:DE=1:2,EF⊥EA，交与点F，则EF:EA？_百度知道
已知正方形ABCD，点E在CD上，且CE:DE=1:2,EF⊥EA，交与点F，则EF:EA？
提问鍺采纳
设AD=CD=3a∵CE:DE=1:2∴CE=1/3CD=aDE=2/3CD=2a∵EF⊥EA∴∠DAE=∠CEF(同为∠AED的余角）∴Rt△ADE∽Rt△ECF∴AD/CE=DE/CFCF=CE×DE/AD=a×2a/3a=2/3a∴在Rt△CEF中EF=√[CE²+CF²)=√[a²+(2/3a)²=√13/3a在Rt△ADE中：EA²=AD²+DE²=(3a)²+(2a)²=13a²EA=√13a∴EF∶EA=(√13/3)a∶(√13)a=1∶3
提问者评价
谢谢你的耐心解答，好详细吖
其他类似问题
按默认排序
其他2条回答
题中&EF⊥EA，交与点F&，是点F在BC边上吗？如是，计算如下：∵△ADE∽△ECF∴AD／CE＝DE／CF∵DE＝2AD／3　　CE＝AD／3　CF＝DE＊CE／AD＝2AD／9∵EA＾2＝AD＾2＋DE＾2＝（13／9）AD＾2　EF＾2＝CE＾2＋CF＾2＝（13／81）AD＾2∴EF／EA＝1／3
EAD-EFC相似EF:EA=EC:AD = 1/3
等待您来回答
下载知道APP
随時随地咨询
出门在外也不愁