已知:如图,
,
,
.求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bd6a2b112facda441f4e34bf5c145fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec4eb563f0ddea344d5827f1180c9443.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69ee4efe3a7e48a8ea0059228947b8f9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/20/0b4b31c2-40d8-4b18-af25-684d21e5c447.png?resizew=132)
更新时间:2022-09-20 10:44:42
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相似题推荐
解答题-证明题
|
容易
(0.94)
【推荐1】如图,已知∠A=∠ACE,∠B=∠BDF,且∠A=∠B, 求证:EC∥DF.
![](https://img.xkw.com/dksih/QBM/2019/9/19/2294188090433536/2294560969302016/STEM/b2456b3ad07f431aac74854771979c0a.png?resizew=150)
您最近一年使用:0次
解答题-证明题
|
容易
(0.94)
【推荐1】如图,直线
分别与直线
、
交于点
、点
,
,射线
、
分别与直线
交于点
、
,且
,则
与
有何数量关系,并给出证明.
![](https://img.xkw.com/dksih/QBM/2022/8/11/3042453359910912/3049768000692224/STEM/4f08048e51fb4dc497b44451c5e67b6c.png?resizew=214)
请你将以下证明过程补充完整.
解:
,
______(同位角相等,两直线平行)
______(两直线平行,内错角相等).
,
______
.
______,
______.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e53497af8899cb299d762f1a4f46a55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b46c607b3deac746c0ef3389ad8f65c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c4c865445dda4a59b6d5cb18fd74404.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a10e9c078acc907693e01bab8a29c37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/605f2976297a0deaa1602ef09d6a5afa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c4c3c0a34dc21292fa32befd58d8f82.png)
![](https://img.xkw.com/dksih/QBM/2022/8/11/3042453359910912/3049768000692224/STEM/4f08048e51fb4dc497b44451c5e67b6c.png?resizew=214)
请你将以下证明过程补充完整.
解:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c08980b6afedc04aa04f385791f0163.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ec8ccf48178d44d1f1e8d9af4bd33a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62a8d0680f1efe07cb5ee9e4e6bbd6f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0c06422e1d55db3077257af113df4bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f449a5f141ea1acb2bcdeb33956a97bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
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解答题-问答题
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容易
(0.94)
【推荐2】BD是∠ABC的平分线,ED∥BC,∠FED=∠BDE,则EF也是∠AED的平分线.
![](https://img.xkw.com/dksih/QBM/2020/7/9/2502263238696960/2503798053183488/STEM/42ae7ab600d34ae099a51742322b3642.png?resizew=168)
完成下列推理过程:
∵BD是∠ABC的平分线,
∴∠ABD=∠DBC(_____________________________________)
∵ED∥BC(已知)
∴∠BDE=∠DBC(_________________________________)
∴∠ABD=∠BDE,
又∵∠FED=∠BDE(_____)
∴EF∥BD(_________________________________),
∴∠AEF=∠ABD(_________________________________)
∴∠AEF=∠FED(_________________________________),
∴EF是∠AED的平分线
![](https://img.xkw.com/dksih/QBM/2020/7/9/2502263238696960/2503798053183488/STEM/42ae7ab600d34ae099a51742322b3642.png?resizew=168)
完成下列推理过程:
∵BD是∠ABC的平分线,
∴∠ABD=∠DBC(_____________________________________)
∵ED∥BC(已知)
∴∠BDE=∠DBC(_________________________________)
∴∠ABD=∠BDE,
又∵∠FED=∠BDE(_____)
∴EF∥BD(_________________________________),
∴∠AEF=∠ABD(_________________________________)
∴∠AEF=∠FED(_________________________________),
∴EF是∠AED的平分线
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