(1)感知发现:在学习平行线中,兴趣小组发现了很多有趣的模型图,如图
,当
∥
时,可以得到结论:
在学习逆命题时,发现原命理是真命题,逆命题不一定是真命题,于是兴趣小组想尝试证明:如图
,
,求证:
∥
,请写出证明过程.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/13/a5029255-551c-4d7f-8089-c2a504251b68.png?resizew=559)
利用这个“模型结论”,我们可以解决很多问题:
(2)综合与实践:在综合与实践课上,同学们以“一个含
角的直角三角尺和两条平行线”为背景开展数学活动,如图
已知两直线
,
且
∥
和直角三角形
,
,
,
创新小组的同学发现
,说明理由.
(3)实践探究:缜密小组在创新小组发现结论的基础上,将图
中的图形继续变化得到图
,
平分
,此时发现
与
又存在新的数量关系,请直接写出答案.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.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/8cf36560a84a4920966dab2d413546b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd6d9ef732deabacced5b48b2e32cf49.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/2023/5/13/a5029255-551c-4d7f-8089-c2a504251b68.png?resizew=559)
利用这个“模型结论”,我们可以解决很多问题:
(2)综合与实践:在综合与实践课上,同学们以“一个含
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6b86c22b670a8e9f3896f9e8883fbbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6dd0caec008c15302ca973b8e655b748.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a3cc9cccfb4c260dac05f4ed57e8c10.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab926d89b65f26c12e3da73ef1e5cf68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebad6350940883c22b8a38f301c83af7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00cc912c681e6b9e69343294b7faea40.png)
(3)实践探究:缜密小组在创新小组发现结论的基础上,将图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d73b2448f9aba5ca9885fd1edd1bca1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5b69d40b75d582c4b8ffa2369af1d41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d57899ad4774aed9ccc7bd23db72153.png)
22-23七年级下·江苏南京·阶段练习 查看更多[3]
江苏省南京市江宁区竹山中学2022-2023学年七年级下学期3月月考数学试题(已下线)综合复习与测试(5)(期末模拟测试卷)-2022-2023学年七年级数学下册基础知识专项讲练(苏科版)江苏省南京市秦淮区2023-2024学年七年级下学期3月月考数学试题
更新时间:2023-05-10 10:05:37
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相似题推荐
解答题-证明题
|
适中
(0.65)
名校
【推荐1】已知,如图,
,
,试说明
的道理,以下是说明道理的过程,并在括号内填出所得结论的理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/4/7af0b257-adc7-4589-b69d-362a5ffaeb4b.png?resizew=146)
∵
,(已知)
,(______)
∴
,(______)
∴
,(______)
∴
,(______)
∵
,(______)
∴
,(______)
即
,
∴
(______).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e53497af8899cb299d762f1a4f46a55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0bd8869f34219e7fbe5a9b8842667c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94f6cce6e8470961c21d5cbbde1ed224.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/4/7af0b257-adc7-4589-b69d-362a5ffaeb4b.png?resizew=146)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e53497af8899cb299d762f1a4f46a55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1732361ed319691e9a7a5318ba54b60.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dd26c1bff3bb1de35650a46e53a9cde.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7e761b398fcac475fe25be23ba35856.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0bd8869f34219e7fbe5a9b8842667c1.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0403b866808f3749b09f9e8a7936e9d9.png)
即
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08a11c34f8c89075543ee9bb483bdfe0.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94f6cce6e8470961c21d5cbbde1ed224.png)
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解答题-证明题
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适中
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【推荐2】如图,三角形ABC中,点G在线段BC上,且
交AB于点F.点P在直线AB上运动,
交直线BC于D,过点D作
,交直线AC于E.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/20/90a12b3c-36ad-43c3-a60a-15042cfe7a1a.png?resizew=273)
(1)如图1,当点P在线段AB的延长线上时,求证:
;
(2)如图2,延长ED至点S,延长BD至点T,当点P在线段BA的延长线上时,点H在线段AC上,连接GH,已知
,
①求证:
;
②若
,
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7699dd30e08702bfc6499eb9c89e54a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c65334978b0519b379910dfc4acf8344.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78370b172c7319282badcd61b4951d76.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/20/90a12b3c-36ad-43c3-a60a-15042cfe7a1a.png?resizew=273)
(1)如图1,当点P在线段AB的延长线上时,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1570f907df046d5fc8983be0f5577f69.png)
(2)如图2,延长ED至点S,延长BD至点T,当点P在线段BA的延长线上时,点H在线段AC上,连接GH,已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cb0d5e891cd1cdc813d83e00f6b7518.png)
①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/196fa22dc2e6c42533da0ec2f3600b99.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5683b4d401345616a34d705031d0d4ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c067346f1fd43eb3b14b095b4e162bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/527ba12c15182827768fdb327ca29869.png)
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解答题-证明题
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【推荐1】(1)已知:如图1,在△ABC中,∠ABC的平分线与∠ACB的平分线交于点O,求证:∠BOC=90°+
∠A;
![](https://img.xkw.com/dksih/QBM/2019/9/25/2298537842180096/2301038917771264/STEM/4d70bf711b1547b1a96c6bec2f1c7c02.png?resizew=277)
(2)如图2,在△ABC中,BP,CP分别是△ABC的外角∠DBC和∠ECB的平分线,试探究∠BPC与∠A的关系.
(3)如图3,在△ABC中,CE平分∠ACB,BE是△ABC的外角∠ABD的平分线,试探究∠BEC与∠A的关系.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://img.xkw.com/dksih/QBM/2019/9/25/2298537842180096/2301038917771264/STEM/4d70bf711b1547b1a96c6bec2f1c7c02.png?resizew=277)
(2)如图2,在△ABC中,BP,CP分别是△ABC的外角∠DBC和∠ECB的平分线,试探究∠BPC与∠A的关系.
(3)如图3,在△ABC中,CE平分∠ACB,BE是△ABC的外角∠ABD的平分线,试探究∠BEC与∠A的关系.
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解答题-证明题
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【推荐2】(1)如图1,AB∥CD,点E是在AB、CD之间,且在BD的左侧平面区域内一点,连结BE、DE.求证:∠E=∠ABE+∠CDE.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/10/39aeef0a-d5c5-4bf8-9d90-bafef73e8d1c.png?resizew=428)
(2)如图2,在(1)的条件下,作出∠EBD和∠EDB的平分线,两线交于点F,猜想∠F、∠ABE、∠CDE之间的关系,并证明你的猜想.
(3)如图3,在(1)的条件下,作出∠EBD的平分线和△EDB的外角平分线,两线交于点G,猜想∠G、∠ABE、∠CDE之间的关系,并证明你的猜想.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/10/39aeef0a-d5c5-4bf8-9d90-bafef73e8d1c.png?resizew=428)
(2)如图2,在(1)的条件下,作出∠EBD和∠EDB的平分线,两线交于点F,猜想∠F、∠ABE、∠CDE之间的关系,并证明你的猜想.
(3)如图3,在(1)的条件下,作出∠EBD的平分线和△EDB的外角平分线,两线交于点G,猜想∠G、∠ABE、∠CDE之间的关系,并证明你的猜想.
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