阅读理解,请在横线上补全推理的理由.
已知:如图,点
在直线
上,点
在直线
上,
,
.试说明:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4e6f5241f614c7d310cbf3e25a6d615.png)
理由:因为
(已知)
(______)
所以
(等量代换)
所以
(______)
所以![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9e6bdf3c3589f88ae4ca71afe54cb50.png)
又因为
(已知)
所以
(等量代换)
所以
(同旁内角互补,两直线平行)
所以
(______)
已知:如图,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e53497af8899cb299d762f1a4f46a55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/682dc163baa74e18746d3d52da6cff7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4e6f5241f614c7d310cbf3e25a6d615.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/5/5703632d-4b42-481f-a4e5-5abe0bfcd34e.png?resizew=168)
理由:因为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e53497af8899cb299d762f1a4f46a55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12b1fe9e36e3c6c432588154d02647ca.png)
所以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3fa8c602423195908247c1567ce0b6c.png)
所以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a710061331ee8ce2a93186f7fef49fa9.png)
所以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9e6bdf3c3589f88ae4ca71afe54cb50.png)
又因为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/682dc163baa74e18746d3d52da6cff7e.png)
所以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44701043e31f7589bb85bdde36de88f2.png)
所以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5adaae99b4ac308549134169e69247a6.png)
所以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4e6f5241f614c7d310cbf3e25a6d615.png)
更新时间:2023-08-01 13:38:18
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【推荐1】如图,OC是∠AOB的平分线,且∠1=∠2,试说明EF∥OB.
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【推荐2】如图,点
在
上,已知
平分
平分
,请说明
的理由.
(__________),
(________________),
所以
(________________).
因为
平分
,
所以
________(___________).
因为
平分
,
所以
_________,
得________(____________),
所以________(____________).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
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所以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c3df6ee648dbf41ff01d2a0d014106a.png)
因为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d73b2448f9aba5ca9885fd1edd1bca1.png)
所以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d345197029bf99ba296bb5fc36222e2c.png)
因为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/907d5147cea4c9ce855074864fe54506.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66efb2e5b7aa63e8561be256d691fc88.png)
所以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38011a315de7ee360444933850a015a1.png)
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名校
【推荐3】下面是小明设计的“过直线外一点作已知直线的平行线”的尺规作图过程.
已知:如图1,直线l及直线l外一点P.
求作:直线
,使
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/16/cd863819-8944-42e3-b2eb-470888a35a9f.png?resizew=389)
作法:如图2,
①在直线l上取一点O,以点O为圆心,
长为半径画半圆,交直线l于A,B两点;
②连接
,以B为圆心,
长为半径画弧,交半圆于点Q;
③作直线
.
所以直线
就是所求作的直线.
根据小明设计的尺规作图过程,
(1)使用直尺和圆规,在图2中补全图形;(保留作图痕迹)
(2)完成下面的证明.
证明:连接
,
因为
,
所以
(①)(填写推理依据).
所以
(②)(填写推理依据).
所以
(③)(填写推理依据).
已知:如图1,直线l及直线l外一点P.
求作:直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b43460283aa3418a0ed8296ad9ac7eb1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/16/cd863819-8944-42e3-b2eb-470888a35a9f.png?resizew=389)
作法:如图2,
①在直线l上取一点O,以点O为圆心,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
②连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
③作直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
所以直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
根据小明设计的尺规作图过程,
(1)使用直尺和圆规,在图2中补全图形;(保留作图痕迹)
(2)完成下面的证明.
证明:连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23418075bc5e575a773ab361010cd7a3.png)
因为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0859089d0f79b09e185b8c669302e3fd.png)
所以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b63bda4612c39b351aeda34615209f31.png)
所以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05df1528288dd03db8a9b66392c0e4d2.png)
所以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b43460283aa3418a0ed8296ad9ac7eb1.png)
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(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
(2)若
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
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