下面是吴老师在课堂上给同学们出的一道有关平行线的性质和判定的试题,请你将下面的推理过程及依据补充完整.
【题目】:如图,已知:
,求证:
.
【推理过程】:
证明:
(已知),
(内错角相等,两直线平行),
( ).
(已知),
( ),
_________( ),
_________( ).
(已知),
(等量代换),
( ).
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/6/67d9b6ec-10f0-4e69-bb48-60c357a2994b.png?resizew=242)
【题目】:如图,已知:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38ff67500c72efbedd8760a7cb1e4215.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd81adb13f5a7550b0f94f770900a613.png)
【推理过程】:
证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b935732f6b3803a5a6110a2da046d8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/783fcf5332eea67e81498764012b586f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9bbd4be94f26dc0fb440d0cfba9e8920.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c49e7faa3f57ce53f078c6b5cd5996d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4870d3bd40c784f62c3856466a78b52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3111d50844b6d88aadd123ab7261514a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ec8ccf48178d44d1f1e8d9af4bd33a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49111b4a20de7e0c823b4c76d591241d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9456dadadf10868949f1dd3c95b1c6f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b528e0fe99511255a7d7b85433d1d240.png)
更新时间:2023-06-04 15:30:41
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解答题-证明题
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适中
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【推荐1】如图,射线AG与直线EF相交于点C,在射线AG的右侧分别过点A,C作射线AB,CD,且CE平分
,
.
;
(2)H是射线AB上的一点,CI平分
,连接HI,
的平分线交直线EF于点K.
①如备用图1,若
,求证:
;
②如备用图2,若
,
,
,求
的值.(用含
的式子表示)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c7a82bf203df79ba6c0ef80026198d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6546f9c7a2b3aef258d33d79e9da83d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.png)
(2)H是射线AB上的一点,CI平分
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdb8eca20ce2c918ea4034ea15210c7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46804e60f4e177217f93093a1d639a02.png)
①如备用图1,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38ce56396695027443681630ce688c32.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cb646eca9d2d951636b3c87023d6983.png)
②如备用图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a94b11117998ff5cee01c0979362e60f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fd465973943bcd766b5275ee204bbf2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5ffd1eaca61ae135acdff86811f8866.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
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解答题-问答题
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适中
(0.65)
【推荐2】如图,直线
与直线
,
分别交于点
,
,
是它的补角的3倍,
.判断
与
的位置关系,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.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/d5b69d40b75d582c4b8ffa2369af1d41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e2321173f6ddf1a2c5fa3b711725750.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/23/43f6604d-15d1-4948-bc73-f4d6c7a57ee4.png?resizew=196)
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解答题-证明题
|
适中
(0.65)
【推荐1】数学课上,李老师提出下面的问题:
已知:如图,在
中,
,
是
的外角
的角平分线.
求证:
.
小晗的思路如下,请在括号内填写推理依据并完成证明.
证明:∵
是
的外角,
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/29/175214c6-084f-44f6-9e8c-c4be653d27d3.png?resizew=100)
∴
(__________).
∵
,
∴
.
……
已知:如图,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4354365ca0929f8a606ed0bf341e4ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5157b42da58d55daad27d98b2fec15ff.png)
求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/542b5bc10c7341c04c22244f3ec16e6a.png)
小晗的思路如下,请在括号内填写推理依据并完成证明.
证明:∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5157b42da58d55daad27d98b2fec15ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/29/175214c6-084f-44f6-9e8c-c4be653d27d3.png?resizew=100)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af4ca7269e718ba4830aacd89bfde394.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4354365ca0929f8a606ed0bf341e4ca.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51d526a8b42de811af3911c6b215b27a.png)
……
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【推荐2】已知,如图,BD平分∠ABC,∠1=25°,∠2=50°.试判断ED与BC的位置关系并说明理由.
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名校
【推荐1】已知:
中,
、
的角平分线相交于点
,过
作
交
于点
,交
于点
,求证:
.
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febc9a89d0d1c97b88c0f4acd32b4e67.png)
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【推荐2】如图,已知l1∥l2,∠A=40°,∠1=60°,求∠2的度数.
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