(1)如图1,
,
为平面内一点,
,小颖认为若过点
作
,很容易说明
和
互余.请你帮小颖写出具体的思考过程.
(2)如图2,
,点
在射线
上运动,当点
运动到点
与点
之间时,试判断
与
,
之间的数量关系,并说明理由;
(3)在(2)的条件下,当点
在射线
上的其他地方运动时(不与点
重合),请直接写出
与
,
之间的数量关系.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4f29779edb82350349f2c4883180f0c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df7c813e0ca36b64d9bb8e2698b30749.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d76e136e7df3692ae6536fc70b6961a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e7eefad280b3c7c7db88ac005c7e583.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/13/997f0e6f-0361-4355-a91a-e5937d1f6cb6.png?resizew=118)
(2)如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21037e170bdbb322558e79c40c00b454.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d7890f747854b8fcf25dcff1991fb84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d76e136e7df3692ae6536fc70b6961a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e7eefad280b3c7c7db88ac005c7e583.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/13/650002e8-dab5-43db-bcdc-e4a0bd793c36.png?resizew=143)
(3)在(2)的条件下,当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21037e170bdbb322558e79c40c00b454.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca4c38a4e43d35410eb96b0ca1026ba9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d7890f747854b8fcf25dcff1991fb84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d76e136e7df3692ae6536fc70b6961a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e7eefad280b3c7c7db88ac005c7e583.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/13/6414a3fc-cf83-4ecd-968d-37a296d65d24.png?resizew=144)
更新时间:2023-07-08 18:05:44
|
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解答题-问答题
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较易
(0.85)
【推荐1】如图,已知直线AB∥DE,∠ABC=80°,∠CDE=140°,求∠BCD的度数.
解:过点C作FG∥AB
因为FG∥AB,AB∥DE(已知)
所以FG∥DE( )
所以∠B=∠ ( )
∠CDE+∠DCF=180°( )
又因为∠B=80°,∠CDE=140°(已知)
所以∠ =80°(等量代换)
∠DCF=40°(等式性质)
所以∠BCD= .
解:过点C作FG∥AB
因为FG∥AB,AB∥DE(已知)
所以FG∥DE( )
所以∠B=∠ ( )
∠CDE+∠DCF=180°( )
又因为∠B=80°,∠CDE=140°(已知)
所以∠ =80°(等量代换)
∠DCF=40°(等式性质)
所以∠BCD= .
![](https://img.xkw.com/dksih/QBM/editorImg/2024/6/11/d3afe7f4-bc89-4cca-b5ae-3433f203acde.png?resizew=209)
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解答题-证明题
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较易
(0.85)
【推荐1】(1)如图①,在
中,
平分
,过点D作
.直接写出图中的等腰三角形: ;
(2)如图②,
中,
的平分线交于点O,过点O作
.证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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(2)如图②,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35dfcea1c4916f1554f717ee55ea3eb0.png)
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解答题-证明题
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真题
【推荐1】如图,在
中,
平分
,交
于点E;
平分
,交
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.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
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解答题-问答题
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(0.85)
【推荐2】如图①,
,且
,
的度数.
(2)如图②,试猜想
与
、
之间的关系.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/053797b51b939d83328248fdcee897e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb3de20ba8bda63c650ef571be155702.png)
(2)如图②,试猜想
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febc9a89d0d1c97b88c0f4acd32b4e67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/194741f4d2ae7ee44cafca780361446a.png)
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